PDF malware analysis — malicious · bfefad8b8af73f9f

MALICIOUS

PDF

225.6 KB

MD5: 8ea9c70dcd541353c432a68d2b171768 SHA-1: e64e53048763b3851d89e95c2aca2e36e70d2974 SHA-256: bfefad8b8af73f9fd64d4157ee083e1876ab38c7530f395cb2159d1bc9e3bd91

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, which utilizes `eval()` and `String.fromCharCode()` for obfuscation. This JavaScript is highly suspicious and likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection signature 'Pdf.Exploit.Agent-36086'. The presence of JavaScript actions and embedded JS streams points to a malicious exploit delivery mechanism.

Heuristics 6

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)
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` `f62be7aa4f1956eaad41a58557ccedcc4d8f754c05a93eaadddc74f800571d9f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	317412 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).

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