PDF malware analysis — malicious · f42bf4a5ae92b6ef

MALICIOUS

PDF

5.1 KB

MD5: a400f0d6a76aaccaf0c3fb0e2c650772 SHA-1: 66c3e4b4f906d9f4ac5dd39e7a0864fdc81e9b54 SHA-256: f42bf4a5ae92b6ef1e7c0a027ea3440158589b97afdcaabd5be7ca34c7dba03e

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 JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation and dynamic code execution. The heuristic 'Suspicious extracted artifact' also flags obfuscated script content. This points to the script's likely intent to download and execute a second-stage payload. No specific malware family could be identified.

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_obj23860_000.js` `d3c248ba2dc37f85b12914178824f26a4798bd3ebc89df0332572b2f81b11313`	pdf-javascript-stream	PDF /JS object 23860 at offset 0x133	8375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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