PDF malware analysis — malicious · c0fb235e503ea94f

MALICIOUS

PDF

9.4 KB

MD5: 6069cdcf46348f913a2a3c186c6287bb SHA-1: 6012c3e920c1e334c28dd1335d3f8811f6c68a29 SHA-256: c0fb235e503ea94fbd0d3c8c76b2a07bbaf675cdad4cbac681a55f9b5a76a0a5

126 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, triggered by the 'Collab.collectEmailInfo' method, which is a known exploit for CVE-2007-5659. The JavaScript is heavily obfuscated and appears to be a stager designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and a deobfuscated script of significant size indicates a complex malicious 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `67d21bbc4ec5be3448667c32ee0895b0e888b42fdf1baf2589162e540f23df4d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5067 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `f9666e0d2986823e6c5b7c9629ed2ae9afe87815ba70b346a2ef68a4f630db69`	deobfuscated-js	PDF JavaScript deobfuscation pass	70592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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