PDF malware analysis — malicious · 86aed3d3f5cf28a1

MALICIOUS

PDF

20.9 KB

MD5: dac817f0e36529be53d2a13a170e4c94 SHA-1: c5826d2e0e96dfd3017b19fce3b4926334505df9 SHA-256: 86aed3d3f5cf28a18910e1cdce746f6023c978ebd517102cc92627f3dc2c07d1

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF that contains embedded JavaScript, as indicated by multiple heuristic firings and the presence of an extracted JavaScript file. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically a PDF exploit. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36088 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36088
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_obj0007_000.js` `9fd87306e37a04c361ea1b68a1cf4474b7a018e2270929a8c382cd129d8fc406`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	566 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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