PDF malware analysis — malicious · bbd643dfa2245124

MALICIOUS

PDF

118.6 KB

MD5: c71878249fb333c13cec13b5deef0bc6 SHA-1: 96bc8140be986f689818cc40ede38e443f18f837 SHA-256: bbd643dfa224512414938d5d657f7b12dfae12e51bee09cd74bdecedd89e56cf

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 'Pdf.Exploit.Agent-36086' strongly indicates a malicious PDF exploit. High-severity heuristics like 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' confirm the presence of obfuscated JavaScript designed to execute arbitrary code. The embedded JavaScript stream, identified as 'javascript_obj0006_000.js', is the likely mechanism for delivering the exploit. The absence of readable document body text means the specific lure cannot be determined, but the technical indicators point to a typical exploit delivery pattern.

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` `df1c48ee88f9d9c1e996b2b32398048db3da64c0e851cba4c36248a70b66cd14`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627082 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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