PDF malware analysis — malicious · b45905afcdaf6fd5

MALICIOUS

PDF

17.4 KB Created: 2009-08-11 21:10:10 Authoring application: qOjGl9 (via ahTuCyr)

MD5: 4d86e257c0bc82bfd3b0435f359e2e12 SHA-1: 62bb94bc71a06069570dfb21d49aa178525894ff SHA-256: b45905afcdaf6fd56c117609bc3a941d658be80b0c4f8de692c0cb0f1ec6fecc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing String.fromCharCode and eval() calls, as flagged by PDF_FROMCHARCODE and PDF_EVAL. ClamAV detected this as Js.Trojan.Obfus-48, suggesting a known JavaScript-based malware. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is obscured by the obfuscation.

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` `314d33aabc5fdfdf7715e3773f6c647608c69daf4723176b127354c185cc02a6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x237	16452 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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