PDF malware analysis — malicious · afce74043809edcf

MALICIOUS

PDF

2.7 KB

MD5: cf39762cc29592087eb6cadebb5ceef6 SHA-1: 4658a907d6fd275c6a7c80ad6e95be8597aa6ebe SHA-256: afce74043809edcf6537d8eaca281eddc214f38b89cf0b4d90207b97b2d1109b

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and String.fromCharCode for obfuscation. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload. The presence of multiple JavaScript objects suggests a multi-stage infection process. Due to the obfuscation, the exact nature of the payload could not be determined.

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_obj111711_000.js` `9e54fe1bab1be48eea966908bd94ea1fef1d4e9ae0d11ccd38265861ff035d25`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `a02a45ce1c05432bb5a48f6ee9eb19ac50b9c45a503968c83efdb45ab14de692`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x248	3042 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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