PDF malware analysis — malicious · e83c16d80303be94

MALICIOUS

PDF

9.0 KB

MD5: d7104c1fb898ab371f5f1cb33fa4ed1c SHA-1: 8adae0dce6679b9d8a0155fbc9bf8e19a7742522 SHA-256: e83c16d80303be94d178582a74b815a98a94c08eee2fbb6886addb2428acdb88

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The file is a PDF containing embedded JavaScript, which is flagged by multiple heuristics including critical detections for CVE-2007-5659 and ClamAV's Pdf.Exploit.Agent-35905. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, particularly the deobfuscated streams, likely facilitates the exploitation of the CVE-2007-5659 vulnerability to download and execute a secondary payload.

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)
ClamAV: Pdf.Exploit.Agent-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `6c19495fe12483bd30f68f65bfbaccb8b75752601652a3ae87dedd3c68d99e77`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11750 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `fc409b13fb537edcdfd04e71b24f1054e98cc23cbb15dc0a27a87d4bd33061fa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4866 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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