PDF malware analysis — malicious · b51a4fc1734c7e61

MALICIOUS

PDF

118.6 KB

MD5: 79fac1335278464179cbdf9614460b86 SHA-1: 3680a505eecb28bfafbb96c631b59ff4769d3b18 SHA-256: b51a4fc1734c7e615cc35641e5a42b2629607d715e2f01b7b69a03b4e5bf3d46

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded eval stager. ClamAV detected this as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for delivering malware via malicious documents.

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` `06ad1533f5321db0d8905d2dd98efdf4069746ba9e03d4d01e8e7af1a89ab596`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626594 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_off0001d6c2.bin` `41e9c659ebc3b59ce6b07991c53f3bbda7490db5a2eb84b728da3091eb2507a7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6C2	300 bytes

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