PDF malware analysis — malicious · 9682726d5ee36068

MALICIOUS

PDF

118.5 KB

MD5: 18083feb1ef653f64cd4de46fdb06aee SHA-1: 50cc34ae863387b32a57864cb2a2c9f2e548d625 SHA-256: 9682726d5ee36068becd48e7c9f0b5e9dd19e7f3af4b1a8500453d57abad2f5a

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. Static analysis reveals the presence of embedded JavaScript, including a high-severity 'eval()' call and a 'Large comment-padded JavaScript eval stager'. These heuristics indicate that the script is designed to obfuscate and execute malicious code, likely leading to the download and execution of a second-stage payload. The document body was unreadable, but the script behavior strongly suggests an exploit attempt.

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` `602159216d479318cc30b14a06ef3df7cccf97c9ef27623b1a8c7e0a8f32bca7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627171 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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