PDF malware analysis — malicious · f7e0161977754822

MALICIOUS

PDF

17.5 KB Created: 2009-07-23 09:35:06 Authoring application: ooCZ5T1m (via roUkpCs)

MD5: 4f21e0f029e41f467e74b936cb3ca2c8 SHA-1: ed4cd660e94498d7065a4bc65f07ad57d4ab1ce6 SHA-256: f7e01619777548221e1e5c74bafc9ee4a50492cc86dd5e226e8832cfde534736

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ClamAV detection 'Js.Trojan.Obfus-48' strongly suggests malicious JavaScript. The JavaScript stream is obfuscated, and the 'PDF_EVAL' firing points to the execution of this obfuscated code. The likely intent is to download and execute a secondary payload, as is common with such obfuscated JavaScript in PDFs.

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` `f3ff4fc93d31470324c5bee2c0c727382ce2be7be884ec8afdb3294cff2d7e74`	pdf-javascript-stream	PDF /JS object 7 at offset 0x225	16616 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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