PDF malware analysis — malicious · a1a56eed64f4e39e

MALICIOUS

PDF

11.7 KB

MD5: 94c5fbc9a8c6a529f98e2ee8219658e0 SHA-1: 070468965184cc890f25c14d7169801fe3c07a0c SHA-256: a1a56eed64f4e39eab8b27e49325aba1a45642f5ac41bdb4155b6e3b4a28a7c5

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains obfuscated JavaScript, triggered by the 'Collab.collectEmailInfo' method, which is a known indicator for CVE-2007-5659. The heuristics indicate this JavaScript acts as a stager, likely to download and execute further malicious content. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack. The document body is unreadable due to encoding, providing no direct content-based clues.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `97b4dd67a9fc99c294182c8e8a0bddab169e5f1b657b220537f589d0703082ce`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	4907 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` `a715fcc7021c2652f66b8c5dd9114337a00b3cf90cd177121905100c5b0e73b2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	11790 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).

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