PDF malware analysis — malicious · e9b61b9c3f3a2dfc

MALICIOUS

PDF

11.8 KB

MD5: fc46abcd801a18e6e87f0a3459dcf9bf SHA-1: 2d54987813d538c57207862089d169275170b4a6 SHA-256: e9b61b9c3f3a2dfc0387c14d4345e9b8d417addc6e7ac690f2371aa16b420c11

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL

The PDF sample contains multiple embedded JavaScript streams and triggers heuristics related to CVE-2007-5659, specifically the 'Collab.collectEmailInfo' method, which is known to be used for exploiting PDF vulnerabilities. The presence of 'annotation_subject_callee_hex_stage_000.js' and other deobfuscated JavaScript files indicates a complex stager designed to execute malicious code. The primary attack vector appears to be the exploitation of a PDF reader vulnerability to run this JavaScript.

Heuristics 7

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)
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `6cfb1314a131492e669928c7e77ef254a1980346ded019dffd7d10c023b07234`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `a6c5a9308b85817baa19c2f1bc1ced53a0388cbbf8b41e988667e8288c5f383e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12015 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `fda4c4a67ef778bfc82a6caacaccde1c2f025dfff511f2a03be28e395e20f3ef`	deobfuscated-js	PDF JavaScript deobfuscation pass	77096 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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