PDF malware analysis — malicious · c0c35bf47efe3dad

MALICIOUS

PDF

8.1 KB

MD5: c79307a2d2167a0553c06b613e9ef7e0 SHA-1: b52d8a007e368dc9728b375e61fda339f7205bd2 SHA-256: c0c35bf47efe3dad63be60a23961e450b81126348879ddbe772251bf1909789e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute code. The ML classifier strongly indicates maliciousness. The JavaScript is heavily obfuscated, but the presence of eval() and String.fromCharCode() suggests it's designed to download and execute a secondary payload. The extracted JavaScript files are likely stages of this execution chain.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0004_000.js` `3749e585f4cb495ccfd2fe59f7c6b652aaee3d753374fc5b47e3b23860e6ff5c`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	306 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d02c92d14afce1842f35fca3eabab64ba47c2eee12ad1688a00505acfe0e5fbb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B19	1777 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `47a790f8cdf1ea9d02a3dde8f767054807722d2a13d65a8ec2bf83350f2cc334`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x359	5060 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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