PDF malware analysis — malicious · b8a96cec1f938afb

MALICIOUS

PDF

11.7 KB

MD5: 64a0a4b72b72f7f3ce884f016a8c3400 SHA-1: 35c554e9aa475e92092e0df050f4a4317cb4d24b SHA-256: b8a96cec1f938afb83af31b00a9544bcf6b8fb0975756f13256a7979921e66e9

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and appears to be a stager for a second-stage payload. The critical heuristic 'CVE_2007_5659' indicates exploitation of a known PDF vulnerability related to the 'Collab.collectEmailInfo' method, which is used to decode and execute the JavaScript. The presence of multiple JavaScript streams and the ClamAV detection further support its malicious nature. The exact payload or download URL is not directly recoverable from the provided evidence, but the intent is clearly to execute arbitrary 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)
ClamAV: Pdf.Exploit.Agent-36165 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36165
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.
Suspicious extracted artifact high 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 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` `206db7e4580446869d57f0b4541964366bf4d20c07d985bbe2dad603412385c4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5049 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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