PDF malware analysis — malicious · 83872559020dfc7e

MALICIOUS

PDF

12.3 KB

MD5: 9c2ea1eaf8e2cdf2cc55b324b9ad986f SHA-1: 0317286d2e39fc667c9829f3a11601c9e4fe0b07 SHA-256: 83872559020dfc7e564a9a68f1fc4bb51c6dbcc0e21ffbc5f7886567840e58a3

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a known vulnerability in PDF handling, specifically related to the 'collab.collectEmailInfo' JavaScript function. This function is used to launch embedded JavaScript streams, as confirmed by the PDF_JAVASCRIPT and PDF_JS heuristics. The extracted JavaScript files, 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are likely responsible for further stages of the attack, such as downloading and executing additional malware. The ClamAV detection further supports the malicious nature of the file.

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `ff8d13dd6bc1c5f840d6984327dd3cf1ef2d9e0bcba1220d13f5c45382cd982e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12034 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `46958dacf024700a3fd161fe09dc64fe92d1d149c5ba9c3c7082d3c05df09fd3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	4897 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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