PDF malware analysis — malicious · 46127498cb59e142

MALICIOUS

PDF

8.1 KB

MD5: 2725bf4c5177b1920d7c66c6fad5d5b2 SHA-1: df3f095b5ef44f5c2af8c327ecd44af4ddde302c SHA-256: 46127498cb59e1426ec95d73325bef1ce3b51c949b5ace7b33bd5aae320133f5

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2007-5659 (Collab.collectEmailInfo). The JavaScript is obfuscated and uses eval() and String.fromCharCode(), indicating it's designed to execute malicious code. The ML classifier strongly suggests malicious intent. The primary attack vector appears to be exploiting a known PDF vulnerability to achieve arbitrary code execution, likely for downloading further malware.

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` `b9f1deb1ed8140433f24a39d49a04ed9cb0ee645d9f1ff88c8d269fd586f4e51`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	302 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` `a93b49c8692030dcd0b471db35cb84b405afcbe65bb56d5ee7d1d510cc7b38cd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B09	1916 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` `0044818d2a9fd21128c19c454f028a1bf928c0dd175176c44311578d842c6134`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x357	5037 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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