PDF malware analysis — malicious · d64f95571f77f44f

MALICIOUS

PDF

12.2 KB

MD5: 57fa2f4bff3611b3dbced8fa53452b7f SHA-1: 13233503d840b4e192f18c1751598d5b0e673f86 SHA-256: d64f95571f77f44f7ddff114d4b054401946f4a1178fda62b5d5e823ba2996f2

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, triggered by the 'Collab.collectEmailInfo' function, which is known to exploit CVE-2007-5659. This indicates the document is designed to execute arbitrary code. The embedded JavaScript streams and deobfuscated files suggest a multi-stage attack, likely involving the download and execution of further malicious content. The critical heuristic 'PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER' further supports the stager-like nature of the embedded script.

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` `d1bbf63bb3c72b27abe08ab9c20e76c9d53ba620fd4f3375817939ebb4db5979`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5169 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` `427091f8a7bf105baea52f438d32679ddb47993e3cb93d7b85df2a7c256eb6fa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12457 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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