PDF malware analysis — malicious · b4edc1129b13d188

MALICIOUS

PDF

11.9 KB

MD5: 675cd9d4759c249f2c5ca1c4b0f8bead SHA-1: b2f8fb2c0eb77aff63f3903c204510ad94750f46 SHA-256: b4edc1129b13d188d146ae553e185b4364edb23e8ecaf0d9ebdf922baeacd475

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, triggered by the CVE-2007-5659 vulnerability using the `collab.collectEmailInfo` function. This JavaScript is designed to download and execute further stages, as indicated by the extracted deobfuscated JavaScript files `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`. The presence of these stages and the exploit trigger strongly suggest a multi-stage 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)
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` `4e1c6ca0ab92273da97fa904f0f63e21d6ae9267eb0589b9c00a9212305d31ba`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5099 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` `7a02d6543e30703c2c549d481299198253fcee5c9c243f19e41dbd7c29cd3bac`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12127 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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