PDF / .TXT malware analysis — malicious · 36637cf0a0bd53cb

MALICIOUS

PDF / .TXT

12.7 KB

MD5: ba854947ac5d5f052053a1710eb8350d SHA-1: 02409bfa0cb9739ceff470e5864b68a5b415c90a SHA-256: 36637cf0a0bd53cb9737a915d1cef2bc1c59a9ae40dad091e9dd7e23ba247673

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, identified as malicious by ClamAV (Pdf.Exploit.Agent-36064). The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method to execute JavaScript, a known vulnerability in older Adobe Reader versions. The extracted JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, likely facilitate the download and execution of further malicious content.

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-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	331 bytes
`legacy_pdfkit_stage_000.js` `39bd2114752e2876b8ee02df3d090697695143f1d6c4aac1029d31a3c0fa0a42`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12182 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `ad9d20bd6cc533aadb31c33aced1b97bcb3f90c02a37e8fba1fc2649d222e8e3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	5035 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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