PDF malware analysis — malicious · 3cd2574a702d0001

MALICIOUS

PDF

9.4 KB

MD5: c243863c2f0fda50fde96222014df76b SHA-1: c10df20befcbc81bd9d46567a7dfad1202ff95a4 SHA-256: 3cd2574a702d0001733ae89b12199f6da79fe70c316917bd31112e4b3c333f46

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1059.003 Windows Command Shell

The PDF exploits CVE-2007-5659 using a JavaScript stager embedded in an annotation's subject field. This stager is designed to decode and execute further JavaScript payloads. The heuristics indicate a complex, multi-stage obfuscation process typical of PDF-based malware delivery. The primary attack vector involves leveraging the 'collab.collectEmailInfo' function to trigger the execution chain.

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` `e868d6db17af0da0c258ecc29b8c93c6b29b42eb1c58de551e11a36b271cf782`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5091 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` `a46b1f66c08e8fb8fa25b88e537e05af1b2bf18078b4584f83d76cb510afacd3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12101 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` `74364d72fdc6267c64a6c248e2ef4ee8dbc8241ae9d3c6a867da7d2150645d3a`	deobfuscated-js	PDF JavaScript deobfuscation pass	45231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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