PDF malware analysis — malicious · 516fb08d50165997

MALICIOUS

PDF

76.6 KB Created: 2010-03-14 23:18:56 Authoring application: s7fUCawXEp (via znEy8x6JBIW3)

MD5: 39e129c4394ca8934c54220a060611fb SHA-1: 72b3bdd7132eb71c7e379f32d40268a71bf1b55b SHA-256: 516fb08d5016599707bd92bd31bd79a50b6287237855e157999631c6331d2d4d

66 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, which are flagged by PDF_FROMCHARCODE and PDF_EVAL respectively. This obfuscation suggests an attempt to hide malicious code execution, likely to download and execute a second-stage payload. No document body text was available for analysis, and the script itself is too obfuscated to determine its exact function.

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` `3ce2b7713cd5efa1b8cf914d1a01879d1cf128f6162e38b012692b2710bac424`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23A	77209 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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