PDF malware analysis — malicious · c5e9e9264707e67a

MALICIOUS

PDF

118.7 KB

MD5: 592dd218f3f2c1fa40da0e43f374167b SHA-1: 6bbc965486b1970cc52423091344f6521b789251 SHA-256: c5e9e9264707e67abed7b72f114be3434e7fbbc7e710a56473b2288e890ac329

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. ClamAV detected this as 'Pdf.Exploit.Agent-36086'. The presence of JavaScript and the eval() call strongly suggest the execution of malicious code, likely to download and execute a second-stage 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` `3f0a18a787e0f0f62267e4731b5b58081d65dc4716e9089d71605b357ef66e99`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627615 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_off0001d77c.bin` `4c0f7228a534b415be12f2006f9d1cbaf655217239a79e5098975ad12dbaa9df`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D77C	300 bytes

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