PDF malware analysis — malicious · cb207e9136f089b0

MALICIOUS

PDF

1.6 KB

MD5: ec6860a938c8b1f5b96234ba78c6195b SHA-1: f89cd43203ae53a2c3c0a3a629a5229e81a13224 SHA-256: cb207e9136f089b0068fa5beb7cab79671ac5ca223e7a2c1d8cd93647be3de4f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating obfuscated content. Heuristics indicate the presence of embedded JavaScript with eval() and String.fromCharCode() calls, suggesting the script attempts to deobfuscate and execute arbitrary code. The extracted JavaScript file, 'javascript_obj0009_000.js', is likely responsible for the malicious payload delivery. The exact intent of the script is difficult to determine due to obfuscation, but it is highly probable that it downloads and executes a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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. (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_obj0009_000.js` `85f15ea493c2a6b39372e2429f3485e6c3204ca014c90f1c0726203220580fdf`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3906 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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