PDF malware analysis — malicious · e57f21b6db3c66d5

MALICIOUS

PDF

4.0 KB

MD5: 876199dcbfe9df9fab4cf3528c04d00e SHA-1: f4d8edf00db8b98558b3ed23589a83e5760f6e86 SHA-256: e57f21b6db3c66d5d3a67736a6c02275eed6fcb9100135e371763bd2a8846594

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely part of the malicious payload delivery mechanism. The primary intent appears to be the execution of a secondary-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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `8f7f44897fb6261949fb5c39ecb1286c379c28d961a34e9056a448969226b002`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `fff28a51f888064880c495de29a4e35a32ebf47d8de52881fcf6f77b8e8d54be`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3573 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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