PDF malware analysis — malicious · 84bf91f71bbdb329

MALICIOUS

PDF

7.5 KB

MD5: e967469a89bb7b8cc63a14c4446a3607 SHA-1: 3d1ec042ce5f28fe8a148b3ed82185ac6c9fc4f9 SHA-256: 84bf91f71bbdb329fe81b698d192022aec3de3c61733eea461908091fb5fd8be

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier also flagged this PDF as malicious with high confidence. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated code execution. While the exact payload is not directly visible, the structure strongly implies the JavaScript is designed to download and execute a secondary malicious payload. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj0004_000.js` `11d156074251c28d51599824b6b29c517009655a63191afae4b096e470a94588`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001ba8.js` `c73b92b4b80c2e9f8b0af7e17e392e6df3eac580fcdc41efea97a91528596af2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1BA8	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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