PDF malware analysis — malicious · e36820314c90f2e3

MALICIOUS

PDF

9.7 KB

MD5: b890ad641a9207b7330f5fa8976de658 SHA-1: 7661027023ca85349149d478f884af98f97d5858 SHA-256: e36820314c90f2e359dcf4040502855373b283c103d6a77381ac2392c56b2a04

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or False Link

The PDF file contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' method, which is a known exploit for CVE-2007-5659. This exploit is designed to download and execute a second-stage payload. The heuristics indicate a hex-encoded stager that is deobfuscated, suggesting a multi-stage attack. The primary function of the embedded script is to facilitate the download and execution of further malicious code.

Heuristics 6

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)
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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `6dc593d9e50e1b115388601f1a8fa419169466be459854e35774bbf62f2b2be4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5279 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` `89b43346a44167894f1d7ebad1da31a3c72f46a8346b90e5d69345c1479c5be1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12516 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` `1c9a38a540482569bba5da729e6d047cff2f6427822c70502f034d94f02d452f`	deobfuscated-js	PDF JavaScript deobfuscation pass	44169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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