PDF malware analysis — malicious · 7f64aa4251df138a

MALICIOUS

PDF

7.9 KB

MD5: dd0b6e13dde90368b9514028f8d0faec SHA-1: 22d1c567ab558d75f655a9557fda378a5b995d2a SHA-256: 7f64aa4251df138a931af7799e7917ca658551b5a3cc4f7060cfa939aced68fc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier strongly indicates malicious intent. The presence of multiple JavaScript streams and the specific CVE exploit point to a malicious PDF designed for exploitation.

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` `80b3cb6f1a2f862801e284037f4122f3d3a4a6bbad8772c8dbb671fccf7f2458`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	312 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` `3894930d59a3c32588e0ee57766ee2edce02f6fc0cdfe1040b292a57998175cc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A67	1708 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` `48c70d294d1dba198860b262a662bc3bc7e0619f37e07954f39c150b48a0e008`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x35F	4936 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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