PDF malware analysis — malicious · aed4ef232aad6569

MALICIOUS

PDF

12.3 KB

MD5: be8bb552cc6c0959e868e105f9ce5d0a SHA-1: c7fa8c07ae4df345d05def021a0e224892dbe490 SHA-256: aed4ef232aad6569ff745bf5395975667f05db328e76fc86ba6c24362a34555f

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains a critical heuristic firing for CVE-2007-5659, indicating exploitation of a vulnerability related to the 'collab.collectEmailInfo' JavaScript function. Further analysis reveals embedded JavaScript stagers, including a large deobfuscated script, which are designed to download and execute further malicious content. The presence of multiple JavaScript streams and the specific exploit detection strongly suggest this PDF is a malicious dropper.

Heuristics 7

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `80b78dba9ebf2a9fc5a5cd8d50108d7f36929de215bfc7a24762c4d1cdcc1390`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5255 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `e7b5818770e6138f0238ffd321fa4d3778e3a39bc7af6cb5cd7ccb1ee92c3214`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12458 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `901befb2d6bfe93bc0854e56dd460a8c2dae43cfc97b81c662f4db27155cb902`	deobfuscated-js	PDF JavaScript deobfuscation pass	85854 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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