PDF malware analysis — malicious · 95b55f55bf31304c

MALICIOUS

PDF

12.0 KB

MD5: cb4f6a3181ecac1bbf205bbeda51c51a SHA-1: a9474d1597022c381839eff962681caa7d8b7c50 SHA-256: 95b55f55bf31304c46b7994cf95202c1e3b15f40a0a076a147e6536df58a4e42

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically identified as a stager exploiting CVE-2007-5659 via the 'collab.collectEmailInfo' method. This JavaScript is further obfuscated and decoded, indicating an attempt to hide malicious code execution. The primary function appears to be the download and execution of a second-stage payload, as suggested by the 'stager' heuristic. The ClamAV detection further confirms its malicious nature.

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-36179 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36179
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.
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` `e89d7054d228dd0d7d4de9a02d1607a443ba297f326673115b5825c1b6cb184a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	823 bytes
`annotation_subject_callee_hex_stage_000.js` `a2bacdca06bf61990ae74e955ed8ac0150e630c4f5b5e121bcb8d014d485f167`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5172 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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