PDF malware analysis — malicious · b010fbd9129399de

MALICIOUS

PDF

14.6 KB

MD5: c1f953eafde538353d3ec8e846b8284c SHA-1: a8f6a716a5fe39a255d5e280e66410dac5a34f77 SHA-256: b010fbd9129399def03d8e11d2d3516be99c53da285f048d9c34a393352ac7db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by a ClamAV signature (Pdf.Exploit.Dropped-94) and a machine learning classifier. Static analysis revealed embedded JavaScript containing an eval() call and String.fromCharCode, indicating obfuscation. The presence of JavaScript actions and an embedded JS stream strongly suggests the PDF is designed to exploit vulnerabilities and likely download a secondary payload. The ML classifier's high confidence score further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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_obj0076_000.js` `c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288`	pdf-javascript-stream	PDF /JS object 76 at offset 0x38E7	144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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