PDF malware analysis — malicious · 41a8fdf795f0d65d

MALICIOUS

PDF

11.9 KB

MD5: f42835f7144084a9264558b8ac21c85e SHA-1: ba4c7a492a69d274c18a064e2dc38ab354212aae SHA-256: 41a8fdf795f0d65dcfe373ecbe9076bea9b0b6da5b9b9e60df649341cd2c6b55

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is a common technique for exploiting vulnerabilities in PDF readers. The critical heuristic 'CVE_2007_5659' specifically indicates the use of the Collab.collectEmailInfo method to execute JavaScript, a known exploit for CVE-2007-5659. The embedded JavaScript streams, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', likely download and execute a second-stage payload. The ClamAV detection further 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` `330aa51823783e76acba17e4d52d98f70bac21328e86e129cd6e91dc383dc908`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f01031852991e699f140b28c1b0c5e69e4588223997a81cfe72e459caf6741e2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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