PDF malware analysis — malicious · f0a9f564d166490a

MALICIOUS

PDF

4.7 KB Created: 2009-05-06 20:45:24 +08:00

MD5: 717c0723591e11bba7f5162776147562 SHA-1: 2833e955d397984cc82497b0953fc88f0aa2cfc5 SHA-256: f0a9f564d166490a2ee07e4c803400532e407523302c7cb97b073271effe757c

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical ClamAV detection (Pdf.Exploit.Agent-35646) confirms its malicious nature. The embedded JavaScript, found in javascript_obj0001_000.js, is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload, a common technique for initial access.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `f99bd431d4836a0aec40b392a46959afdeb9b4b7b50abb0e4ff158fcb61ea21e`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	5723 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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