PDF malware analysis — malicious · 4c167dcee6b37b3c

MALICIOUS

PDF

118.5 KB

MD5: 98ccc5fbf320c40566319e7e83943465 SHA-1: 5104f2854c52e7f7d71bbc34630156cfc0a4a10a SHA-256: 4c167dcee6b37b3cefeb2407cc0e420d6628edf27a25887bd5736ba3b507691d

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file detected by ClamAV as Pdf.Exploit.Agent-36086. Static analysis revealed embedded JavaScript with multiple high-severity heuristics, including eval() calls and a large comment-padded eval stager. This JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the presence of the 'javascript_obj0006_000.js' artifact. The obfuscated nature of the script and the exploit detection suggest a malicious intent 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` `67734e367a072d60b395b5379fb97d3e265074413a60445835f997e4f9afc8bf`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626619 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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