PDF malware analysis — malicious · 87caa588d1de0e06

MALICIOUS

PDF

11.5 KB Created: 2010-06-11 04:48:40 Authoring application: ZXXlMoOwaCkBWNLG (via hTdMdlCnRsNA)

MD5: 94da0761dbdbeb18818eb5c5ab45e078 SHA-1: 2c93eeec068794e9963745cf46c47d8a7d9eccee SHA-256: 87caa588d1de0e06ce522977dd2b03fec89ef90ce4d985a8c9101dad91ada016

116 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript that is obfuscated using String.fromCharCode, as indicated by the heuristics. ClamAV has flagged the PDF as Pdf.Exploit.Agent-35572, and the ML classifier has a very high confidence score. No scripts were extracted from the the PDF, but the overall evidence points to a delivery mechanism based on an obfuscated JavaScript stream within the PDF PDF_JS and PDF_FROMCHARCODE.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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.
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_obj0007_000.js` `3f0e85984e8667e82b9925b01ba4a77fdf1a067266c062ae5d366b5a37721bc7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x3F9	9916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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