PDF malware analysis — malicious · 2fefd1244131f9ef

MALICIOUS

PDF

12.6 KB

MD5: d5a8bdc6789bafa22f25a312b5196f29 SHA-1: 04e6bea8ef7505b787775ec920c85eb5472bfb6e SHA-256: 2fefd1244131f9effe223ed5ebc9bf9c1ae7543c9add9804429c86f60da3b70a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the eval() function and String.fromCharCode, indicating obfuscated code execution. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known PDF vulnerability via the Collab.collectEmailInfo method. This JavaScript is designed to download and execute a secondary payload, as evidenced by the deobfuscated JavaScript streams.

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_obj0005_000.js` `64dcc042fe10206f9a1861be535d511af9d648bbddcb2adf13465aca36bea970`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	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` `9a7e04767bd41e3085db3b13eacbf13f5c4f2401073f7bafc9a2a0bc48c924a8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x309	12175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f8f4a3890d932638294af2131cbea6e5c172d0156c4467ff9862d9e02eecf052`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x309	5029 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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