PDF malware analysis — malicious · d6bb1e9251130e57

MALICIOUS

PDF

15.7 KB

MD5: fc700a7144347a96968bfbd7b7c7b7bb SHA-1: 3f1b590308942702bc35284b929c13af722b043a SHA-256: d6bb1e9251130e573aa1e605cb9ae95fa860190369d20e9e9c69af2e4c45aea4

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

This PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36086, indicating it contains a known exploit. High-severity heuristics indicate the presence of embedded JavaScript, including a large comment-padded eval stager and direct calls to eval() and String.fromCharCode(). These techniques strongly suggest the script is designed to de-obfuscate and execute malicious code, likely downloading a second-stage payload. The ML classifier also returned a very high probability of 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `c8be190b63047621dd6475a84e74977407887800a45c1443cd7520996db8b19b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425147 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).

Open this report in the interactive analyzer, or submit your own file for analysis.