PDF / .VIR malware analysis — malicious · c2972ed3481496e8

MALICIOUS

PDF / .VIR

226.2 KB

MD5: b512191f79bc4a8f04d04dfabddd0641 SHA-1: c46ae3cf10e70e5f6dd77b454b3e9636a740d66a SHA-256: c2972ed3481496e8eba6d696864ba3c97d63b2edf195e78c4ab6358b9e40b899

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, as indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of an eval() call and String.fromCharCode suggests obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The embedded JavaScript file 'javascript_obj0006_000.js' is likely responsible for the exploit, potentially downloading and executing a second-stage payload.

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` `77004c2e230ce313a04276fc0ba2d1586f0e6e33e40d4d298dbb9de1c977034a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	322517 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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