PDF malware analysis — malicious · 55901fc77162d56c

MALICIOUS

PDF

12.1 KB

MD5: 987f7cfcfd92d2d75f06e6146f883d15 SHA-1: 2699d50db4d5c08d33c93058920d94e809ef7d49 SHA-256: 55901fc77162d56c96718059b9d90e6bd9afa423ba349c9a9c03493999f19dd8

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, triggered by the CVE-2007-5659 vulnerability using the 'Collab.collectEmailInfo' function. This JavaScript is likely a stager designed to download and execute further malicious content. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js') indicates a multi-stage attack. The ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature of the file.

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` `5657f664b83892c2a2343828d614605cf95702d5d0a9eb2c8ac3702086542230`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5127 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` `90a0a68bf0f40f1aed15c25a82412d129d5107d563d8604e87cd9fdcc6840dc2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12171 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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