PDF malware analysis — malicious · fdb86de2ed2e521c

MALICIOUS

PDF

118.6 KB

MD5: 9d7b75cf2c353b4f06b0d7de4ffc1899 SHA-1: 2c46f7cbb8738004744f36cdd9b53f1055173c0b SHA-256: fdb86de2ed2e521c8363147488dac24d26e3fca0f21a636b463d31442aa623c5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple heuristic firings indicating embedded and obfuscated JavaScript, including a high-confidence 'eval() call' and a 'Large comment-padded JavaScript eval stager'. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086'. The presence of these indicators strongly suggests the JavaScript is designed to download and execute a malicious second-stage payload. The exact URL or execution method could not be determined due to obfuscation.

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` `4306a92a5522cd8885ded210b56ae4008c808ce6b19cb66c2e80d455e9739985`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626508 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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