PDF malware analysis — malicious · b8372c2894347e6c

MALICIOUS

PDF

17.5 KB Created: 2008-12-31 14:26:47 Authoring application: Hmh5AQpVVPZ3 (via BS0pcTiO6fTZ)

MD5: bb991b8a676058dde4a36f274123be2f SHA-1: 97686aaa6481fbfd585a3d40f5b9780741f39f43 SHA-256: b8372c2894347e6cee3badb2c50703ef67cfbbf43a7e56d4e152ace68a5ea0ab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

This PDF file was flagged as malicious by ClamAV (Js.Trojan.Obfus-48) and a machine learning classifier. Static analysis revealed embedded JavaScript with obfuscated code, including calls to eval() and String.fromCharCode(), indicating an attempt to hide malicious functionality. The primary intent appears to be the execution of this obfuscated script, which is characteristic of malware designed to download and execute further stages.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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_obj0007_000.js` `929628217fc6d3987e7ecd565d62a3362c3d0d220db42c10d6e1152c42803ecb`	pdf-javascript-stream	PDF /JS object 7 at offset 0x239	16547 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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