PDF malware analysis — malicious · 9f1b5fc36538f3f0

MALICIOUS

PDF

11.8 KB

MD5: aa86640eceb46893a12afaa6727bc286 SHA-1: fada0eab67e221a1d2a8ada714e5f9a691cdd3ee SHA-256: 9f1b5fc36538f3f0e779030f2ae2eebc8f230b4fb9dd8697f7cf831fe1bf4932

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF file contains embedded JavaScript, specifically leveraging the 'Collab.collectEmailInfo' method which is associated with CVE-2007-5659. This exploit is designed to execute arbitrary JavaScript within the context of the PDF reader. The presence of multiple obfuscated JavaScript streams further indicates malicious intent, likely to download and execute a secondary payload or perform other harmful actions. The ClamAV detection confirms its malicious nature.

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-36079 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36079
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_obj0007_000.js` `ef8bdac794684ae9cd4eb7091d80e1c5ca478c06c639d72d01626c1f7ce78b6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	578 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` `8d54c445695ac5b92107aac64aa0efdfd8b89b9f244f244b053173e8c94f4d4e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `7bf3760bb6ce63a710e1bc4db64f02088522cf90857290c8f6bd66cce575af6c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5104 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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