PDF malware analysis — malicious · f9ec275389048c38

MALICIOUS

PDF

118.6 KB

MD5: bbd94940c84c030b5d5f64d3c2f6f609 SHA-1: 7af41ef0d6c6ebe815bbaab8ac7751a44032ffef SHA-256: f9ec275389048c38a07e202b552fd354bb9540bbbf08e34feefa456e380c586c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as a malicious PDF by ClamAV, specifically 'Pdf.Exploit.Agent-36086'. Static analysis revealed multiple high-severity heuristics related to JavaScript execution, including the use of eval() and a large comment-padded eval stager. These indicate the PDF contains obfuscated JavaScript designed to execute arbitrary code. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the 'PDF_JAVASCRIPT' and 'PDF_JS' firings.

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` `0ccb5818e55c9b6cff056d96d636b3d9b4b586fefafa6ab12593df9641640807`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627308 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).

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