PDF malware analysis — malicious · f51899cc8f9d2192

MALICIOUS

PDF

12.9 KB

MD5: 79311eab38fc99557f55099d6bc07461 SHA-1: 5811b3dc40cdd6a82c4e221438e2dd91d7d89ce1 SHA-256: f51899cc8f9d2192e48fa25c23eee398f98ca82f617124dc3a5f761b4d0d2bc7

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

The PDF file contains embedded JavaScript that is obfuscated and uses a known exploit technique (CVE-2007-5659) involving the `Collab.collectEmailInfo` method. The heuristics indicate this is a stager designed to execute further malicious code, likely downloading and running a second-stage payload. The presence of multiple deobfuscated JavaScript files further supports this. The specific exploit and stager mechanism point to a malicious PDF dropper.

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)
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Exploit.Agent-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	331 bytes
`legacy_pdfkit_stage_000.js` `4913a11009d571204be497efef4dce61a76bb06e259a63f0e047b35f0a21d005`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12016 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).
`legacy_pdfkit_stage_001.js` `9fdfd4851e2222ed3cfed862b838e3ef069084873751e20117e2da286b8c7a2a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	5000 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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