PDF malware analysis — malicious · bcb62bbadf0acd57

MALICIOUS

PDF

118.7 KB

MD5: 0b67b20105429c51990a942b55492435 SHA-1: e5245cd6b9c44f329fd1ac0ef1b2c17811efd274 SHA-256: bcb62bbadf0acd57aa099def5a93f9ea74bc8c58e0d56aa18b682bbe8b60b4b1

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection and high-severity heuristics for PDF JavaScript evaluation (PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_JS_LARGE_COMMENT_PADDED_EVAL) indicate that this PDF is designed to exploit vulnerabilities. The embedded JavaScript stream, identified as 'javascript_obj0006_000.js', likely contains obfuscated code intended to download and execute a secondary payload, as suggested by the 'Long encoded blob' and 'Script obfuscation indicators' in the static triage. The specific ClamAV signature 'Pdf.Exploit.Agent-36086' further confirms its malicious nature.

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` `96195af9efa68e8f8b377f15069ad774d41a5de523a3efa4c2cfec07520bbdd0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626861 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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