PDF malware analysis — malicious · 331cd8a22f38fa95

MALICIOUS

PDF

4.3 KB

MD5: 9b762944bef97c9f3f7615a2e3666a2a SHA-1: 3748f503c54fb52fe87d7d3cc845a2d92e1b80e1 SHA-256: 331cd8a22f38fa950d5f5fa24353b0e3ffee04229d6ad579da2742a5b067a718

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode within the JavaScript stream suggests obfuscation and dynamic code execution. This JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a second-stage payload. The extracted artifact 'javascript_obj86409_000.js' is flagged for suspicious obfuscation.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj86409_000.js` `77791192df9f8e541c90d322930ed0197849bd29f50590d7e42e47e992756cc4`	pdf-javascript-stream	PDF /JS object 86409 at offset 0x136	8313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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