PDF malware analysis — malicious · f54f5ee177c2d1e3

MALICIOUS

PDF

118.6 KB

MD5: 5f97a4eb5b6af319f04cc2abf4e41158 SHA-1: 17cf44476e5e1e0fc8d1bc8181b2f402fee31284 SHA-256: f54f5ee177c2d1e324672c0f2b4c86992ae589585926aeb6b3da2cd6c8700c18

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly indicates a malicious PDF exploit. The presence of PDF-specific heuristics like 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' confirms the use of JavaScript for exploitation. The embedded JavaScript stream, although large and potentially obfuscated, is the likely mechanism for delivering the exploit. The overall attack pattern is consistent with a malicious PDF designed to compromise the user's system.

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` `84ade74db8b66ef95e426dc62b3f24fe16141958dc8e6044a868a0712de86b88`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626825 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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