PDF malware analysis — malicious · 2c5bdca88020b8ba

MALICIOUS

PDF

118.5 KB

MD5: 42a6b3b7af4139b098d2f91b623cfddf SHA-1: b8615611ea78813947dfa6a64681f4ae508fd51c SHA-256: 2c5bdca88020b8ba55f13d76d1569c664631387b54ea3740bbb5d6f67766dfb4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution, including `PDF_EVAL` and `PDF_JS_LARGE_COMMENT_PADDED_EVAL`. ClamAV also detected it as `Pdf.Exploit.Agent-36086`. The presence of obfuscated JavaScript suggests the file attempts to download and execute a second-stage payload, a common technique for exploiting PDF vulnerabilities.

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` `d02de725a78c7fc977219265683ac8b56b774da63c274c7902dbeefb5b59f8a1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626025 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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