PDF malware analysis — malicious · d9b984b97b1ee9fe

MALICIOUS

PDF

118.6 KB

MD5: f53e3eadc2442ba2be84e46d545417e1 SHA-1: 57099def742654e3a17b3ba13c7dfb2ad141041a SHA-256: d9b984b97b1ee9fe596124da5ac0efbab3d0e911cc970fb2ee3e36559a1116ea

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_LARGE_COMMENT_PADDED_EVAL. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript stream, particularly the 'eval' calls and 'String.fromCharCode' usage, suggests it functions as a stager to download and execute a secondary payload, likely exploiting the PDF viewer. The ClamAV detection name 'Pdf.Exploit.Agent-36086' further supports this.

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` `05d3c6abcc4e2758038cee3cd2aefe69484e837d9fc68b931c2489b9eb831969`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626088 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_off0001d6f4.bin` `d599b6682e2a1f6f849e80e0c072a15212952c352b86521a92c720158ed52366`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6F4	300 bytes

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