PDF malware analysis — malicious · 3689375a2c4c627f

MALICIOUS

PDF

12.2 KB

MD5: b6202a4771583df18c96b7f605807d4a SHA-1: c57a7185abfa8dee71618b3a26ef1a86c38bb3b7 SHA-256: 3689375a2c4c627f8bc7d382acf347b17de0da7cc1d3d57d33ef286fd011c966

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

This PDF file leverages the CVE-2007-5659 vulnerability, specifically targeting the 'Collab.collectEmailInfo' function. The exploit is initiated via JavaScript embedded within an annotation's subject field, which acts as a stager. This stager is heavily obfuscated but ultimately decodes and executes further malicious JavaScript. The primary IOC is the CVE identifier, and the deobfuscated JavaScript file represents the second stage of the attack.

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.
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` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 bytes
`annotation_subject_callee_hex_stage_000.js` `182f1c43ee6c258c551f37a545921b7b1644bebd9949ed456e368036eac74fe7`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5226 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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