PDF malware analysis — malicious · 3daffc553785966e

MALICIOUS

PDF

15.7 KB

MD5: f80f684b9e768982c21a04574ff74d48 SHA-1: 7c6f9cb763c5a40a339ea46b633bc5322761aa73 SHA-256: 3daffc553785966eeff8758500d56e4d903ca96571dd1eedea6387a09c8fee3c

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36086. Static analysis revealed multiple high-severity heuristics related to JavaScript execution, including PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL. These indicate the presence of obfuscated JavaScript designed to be evaluated, a common technique for delivering second-stage payloads. The ML classifier also strongly indicated maliciousness.

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` `4d97108d5b282c312228e0e71e3c6a64f9f7cc156b283041535f6818fc84a149`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425228 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_off00003b72.bin` `5fdb3f1f14a05e5e427812ecbbdd2a9626cdc088cf0109b0111c29b01738a52a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B72	300 bytes

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