PDF malware analysis — malicious · 9785cd271747bd2b

MALICIOUS

PDF

2.2 KB

MD5: f29cec7f8f531f2b6bdb3295e7114b49 SHA-1: 6372a46c07132a8b4a210bc4aba0a68ff7776bf3 SHA-256: 9785cd271747bd2bc71641007ad13614e5651cddb9a8c3caaade7ca6596aaf5f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains obfuscated JavaScript, including calls to eval(), unescape(), and String.fromCharCode(), which are indicative of exploit code. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary technique observed is the use of embedded JavaScript to deliver a payload, likely an exploit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36098 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36098
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj111611_000.js` `e1ab3bbf30605cecdce6db9d2556198626dbb178f7a4cb471a9436bb6e8bd92f`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x798	462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `cd7a2798ed40c94f7e571712d4290cf38aeac87b8ee1e4e986721a038b706e5b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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