PDF malware analysis — malicious · 9a9c0385127b5a04

MALICIOUS

PDF

4.1 KB

MD5: a6863ddc36715375f5ddf931420b8623 SHA-1: 63507f775994d8122ceb964a6c8911871a10b971 SHA-256: 9a9c0385127b5a04f15c54d123fb4b0662460a9ca93bef25b127ce3c2d3e4782

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript stream, particularly the 'acroform_b64_00.js' file, likely contains obfuscated code designed to download and execute a secondary payload, as evidenced by the PDF_EVAL and PDF_FROMCHARCODE firings. The presence of extracted JavaScript files points to a dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7285867-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7285867-0
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` `0540fcba100e1971cc82b4a14d616163901976960b47bcfd7203fd331710dec7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6285 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` `860f7388b8430be8bef248d858865e9de30fdf430f1293d02aab8072fb3be5e6`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3560 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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