PDF malware analysis — malicious · 91c89a5a23267e3a

MALICIOUS

PDF

15.8 KB

MD5: 37e333fe0f895a4073a6b84ecc230b07 SHA-1: 5840eeb640b27194f6e6a27a8c26b010b342d88d SHA-256: 91c89a5a23267e3afdd6af6d418360e0be8fb53a8c1dfcfb9a62a7689d5d7e85

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a heavily padded eval stager, indicating an attempt to obfuscate malicious code execution. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it's an exploit delivery mechanism. The presence of JavaScript actions and eval calls points to the execution of arbitrary code, likely to download and run a secondary payload.

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` `dd06b762bdfbc2778d959b0ee0c943c97f08b29cea2b9379dcacd799b937ec49`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425641 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_off00003b8e.bin` `0d3a8c103f9570538f6a6d85b0ad36656ff76f7356a493b3d39d8c5052da8554`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B8E	300 bytes

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