PDF malware analysis — malicious · f53a00af53a67531

MALICIOUS

PDF

118.6 KB

MD5: 67fe9100966df500d2bc51137d2f05dc SHA-1: aabef4698eb83345a88264ecb07ee5f2471d707e SHA-256: f53a00af53a67531e83235c2cda2ca2fa1c78ec9b762054daf2087d059a363a7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded eval stager. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086'. The presence of these indicators suggests the script is designed to deobfuscate and execute malicious code, likely downloading a second-stage payload. The document body was unreadable, providing no further context on the lure.

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` `560fc0db5d730d80ad2cb3c1d1b5680b0c0fd03006d13eae642a920f15b11e18`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626991 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_off0001d8a3.bin` `b8ad1bd3b49feabe525bde709f44e8929c7d6d7b4a95d9ed4efbd5faeedbd8cd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8A3	200 bytes

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