PDF malware analysis — malicious · a3764e76381c4754

MALICIOUS

PDF

15.7 KB

MD5: fde2de90f69631e159a25063bf971c2e SHA-1: 316933f57e8377e0f5c425f7353989d45e96b779 SHA-256: a3764e76381c4754ba9d844e18edfd8feb8af0ae093c4e7f7e3de4d5b28b9cdd

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. The high ML classifier score and ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggest exploit activity. The primary intent appears to be the execution of a second-stage payload, as indicated by the 'Large comment-padded JavaScript eval stager' heuristic.

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` `ee7bba4a3fb61a949e8cead58ab46b2aa0314ad60cf66e11eeb23e5b807d4fad`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425354 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).
`stream_001_off00003b74.bin` `f342adf038a3924f04d484489926a3a81bf123e69fb0e9c8dff00f349e902476`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B74	300 bytes

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