PDF malware analysis — malicious · 8c9b995c2ef87dbe

MALICIOUS

PDF

12.0 KB

MD5: f9fdfce1e24326ed39d6bbfda71bba6c SHA-1: 15d7e69fb427f25a46b4d33359e2e034d90c1784 SHA-256: 8c9b995c2ef87dbe92ecb5326d0806e73fd63e013c307f92ed314bb8b11d115f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified as a stager for CVE-2007-5659. This JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of the 'Collab.collectEmailInfo' method and the hex decoding mechanism strongly suggest exploitation of this known vulnerability. The extracted JavaScript files are the primary indicators of malicious activity.

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `c860bd3a1b8438b37e98a599719a1868ae540624631f091272ffef48912644f4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	579 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `bc12718b80b386bcaffbb044459f69169f6fb5884c1e21b891f7ff3d77d6ed8d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5457 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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