PDF malware analysis — malicious · 25ca0c02fb8a8b2e

MALICIOUS

PDF

5.1 KB

MD5: 105ec238b444894b8afce899cecd1d04 SHA-1: df2b4eab5778b9cbd00a2b505c243b797ba6f648 SHA-256: 25ca0c02fb8a8b2e9d3397788f910360493b8d491c447979deb3a30cb28b4821

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE rules suggests the script uses obfuscation techniques like eval() and String.fromCharCode to hide its malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload, as evidenced by the suspicious extracted artifact 'javascript_obj294376_000.js'. Due to the obfuscation, the exact nature of the payload cannot be determined, leading to an 'unknown family' classification.

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_obj294376_000.js` `e4c8c798d6a6237a0e329ff1bb4a1cb2881dd66314b96fce27f105ea983c6d7d`	pdf-javascript-stream	PDF /JS object 294376 at offset 0x136	8345 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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