PDF malware analysis — malicious · eb39c237376360a8

MALICIOUS

PDF

11.8 KB

MD5: c41e74dc08a7b7e1c2f5e019288e3b04 SHA-1: 103174e43f60aab0ed6635d594fceb1017638a93 SHA-256: eb39c237376360a8c5bcb5fe107f8d4d63b4ff7735c76d8fcf421eaa4a97e71d

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including CVE-2007-5659, which is known to exploit vulnerabilities in PDF viewers. The embedded JavaScript streams, specifically 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are indicative of a multi-stage exploit. The ClamAV detection 'Pdf.Exploit.Agent-36065' further confirms its malicious nature. The primary attack vector appears to be leveraging the 'Collab.collectEmailInfo' JavaScript function to execute arbitrary code.

Heuristics 5

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-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `b3a7d3cf2d0746678f3398481f200de586aa09c7e1e581da0d15888466e0ba69`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b5b1d47c2f1e33c3e0bd596c2c19ba979ac20c7a38fee7e435c0bdaad7355f1d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4961 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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