PDF malware analysis — malicious · 919232956a57515e

MALICIOUS

PDF

118.5 KB

MD5: f9dd5c9c1933257a4eb7b4ad7a54c947 SHA-1: 3397e5773cf6f3c0204d462dc9b2a7c18c26da5d SHA-256: 919232956a57515e93698c03752efa488e466621bc88e67310df31a59ddac348

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file flagged as malicious by ClamAV with the signature 'Pdf.Exploit.Agent-36086'. Static analysis revealed embedded JavaScript streams, including one that uses `eval()` and `String.fromCharCode()`, indicating obfuscation. A high-confidence ML classifier also flagged the PDF as malicious. The presence of these indicators strongly suggests the JavaScript is intended to download and execute a second-stage payload, a common technique for delivering malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `7c702eea1e5d2d4c76d1977f9c4c9717a08ef4e93d048793e323e4603724cd2a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627111 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `579fb5769ea2aa97f5fb1d865b9c848b4a6493270a2c7f22a5a29e4041f935cc`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 623 long base64-like blob(s).

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