PDF malware analysis — malicious · d81332e2661fd7f0

MALICIOUS

PDF

12.3 KB

MD5: 72c139c5fe67cf873b31ef7524e5423c SHA-1: 9aa60fd9d13cba9a046bcb099c0c492e24d5910c SHA-256: d81332e2661fd7f0a4d75b931e923c10ddbc207d60d87badb1e2ab8746d5c248

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.001 Malicious Link/URL

The PDF file contains embedded JavaScript, specifically identified as a stager for CVE-2007-5659. This JavaScript is heavily obfuscated but is designed to decode and execute further malicious code. The presence of the 'Collab.collectEmailInfo' JavaScript object and the 'CVE_2007_5659' heuristic firing strongly indicate exploitation of this vulnerability. The recovered JavaScript stream, 'annotation_subject_callee_hex_stage_000.js', is the primary component responsible for the initial stage of the attack, likely leading to the download of additional malware.

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` `816a3537912cb7760514130824538a214fbae65ddeb7bc864c4143ee71130830`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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