PDF malware analysis — malicious · 25846c57a3da6084

MALICIOUS

PDF

118.6 KB

MD5: f734e071d3b46f02e47a88453ac0dd8e SHA-1: 0d1aca601649acaf78eeee5560386d21c1c0d32d SHA-256: 25846c57a3da60842fa4635fbb12c1cce5d0cad306a9e40a6363f6b279d3e7d6

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript T1566.002 Spearphishing Attachment

The PDF sample contains embedded JavaScript, including a high-severity 'Large comment-padded JavaScript eval stager' heuristic firing. This indicates the script is designed to execute arbitrary code, likely for downloading and executing a secondary payload. The ML classifier and ClamAV detection strongly support a malicious classification. No document body was available for content analysis, but the technical indicators point to a common exploit delivery mechanism.

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` `d52c4f3a69fa4758741454ee7b360964721461212485528cdabc27a4f186c4fe`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627984 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_002_off0001d88e.bin` `2a8db99e7e5346c18d64bbd77164bf37dc7784c890a676a10a57599b98f23a63`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D88E	200 bytes

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