PDF malware analysis — malicious · a9b7ff638638b38e

MALICIOUS

PDF

4.1 KB

MD5: b9c6275d9301cca2b910aef4a9497cad SHA-1: eaa9bd3c1770b95b5bd5afa44fac63dbc1002e88 SHA-256: a9b7ff638638b38e4741ec00165a3a86d1a7a9f8922cc05d44490c53e93c26ad

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, particularly the deobfuscated version 'acroform_b64_00.js', likely contains code designed to exploit PDF vulnerabilities or download further payloads. The presence of eval() and String.fromCharCode calls suggests obfuscation techniques were used to hide the malicious script's true intent, which is likely to execute arbitrary code.

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_obj0013_001.js` `d58a14a522a91962971df8d1d4fd3a66cc5ccb5ebf9267511e47b3c977105ca2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6357 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `f8831c54b192ec6e3a690a65844ae7bb6415abcc4dedc28ed71073f08500247f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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