PDF malware analysis — malicious · 9313287fcf955a4a

MALICIOUS

PDF

3.8 KB

MD5: 52046353df434c058a57a04eab0aa08f SHA-1: 2684754a928f3e6ae9d7b648860a632e998561d2 SHA-256: 9313287fcf955a4a5d06a08c2d5897e54153140db41e884d1bcc013002cf04b5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `eval()` and `String.fromCharCode()` for obfuscation, a common technique to hide malicious code. This obfuscated script is likely responsible for downloading and executing a secondary payload, as suggested by the 'Suspicious extracted artifact' heuristic. The exact nature of the payload cannot be determined due to the obfuscation, but the overall pattern points to a downloader.

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_obj0006_000.js` `a0edfbc3b7aebda05326be2a29bed9eeec4eac90e8f4c6c635d8792251134540`	pdf-javascript-stream	PDF /JS object 6 at offset 0xA05	4823 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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