PDF malware analysis — malicious · 838b96b227759803

MALICIOUS

PDF

330.1 KB

MD5: c0bcf5ab9aeb25c293e4624cc2517a22 SHA-1: 2b2b71d001b83719a6c307e058dac0930dfb37c4 SHA-256: 838b96b2277598034f4ffe62e08427dcfccf313624b9e81e4422e4bb583f8d60

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL and PDF_FROMCHARCODE heuristic suggests the JavaScript is obfuscated and uses eval() to execute code, a common technique for downloading and running further malicious content. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The extracted artifact 'javascript_obj0006_000.js' is likely the source of the malicious script.

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` `babed563189d3e0b2c0b3f79088fb74989226a93a1a7ac3e3fa5fae1ef2284a6`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	464283 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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