PDF malware analysis — malicious · f91b4e5969878e54

MALICIOUS

PDF

18.0 KB Created: 2010-03-16 23:18:35 Authoring application: T3zQirhi2jD (via NHr0zOrX)

MD5: 9a60c9ac40ed989730cd243d5fe3534c SHA-1: 2918a5d1dd12688016a4f300022dd23d00ec43f1 SHA-256: f91b4e5969878e548a3426a5eec0df1cca2932f074b989d51c449a03d5d393ef

66 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 JavaScript stream is obfuscated and uses String.fromCharCode and eval() to execute its payload. The primary intent appears to be the execution of malicious JavaScript, likely to download and run a second-stage payload.

Heuristics 5

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` `a385ce7e83dd40d70a476aab1508333b3435da3380fb5443a666939aa4543d6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x247	17197 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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