PDF malware analysis — malicious · d36b17322ee4ad20

MALICIOUS

PDF

226.1 KB

MD5: 9fb9dddd390b98f482a64b8905227826 SHA-1: 168ab821073e4a820daaa3c0ec1502842d5ad859 SHA-256: d36b17322ee4ad200d52dd6f83b69e05a65779f8ab0119676e6dceb499a0581a

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, which is a common delivery mechanism for exploits. The presence of `eval()` and `String.fromCharCode()` calls within the JavaScript stream, along with a critical ClamAV detection for 'Pdf.Exploit.Agent-36086', strongly suggests that this PDF is designed to exploit a vulnerability. The JavaScript likely downloads and executes a second-stage payload. The document body was unreadable, but the heuristics and ClamAV detection are sufficient for this assessment.

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` `bcd6e34645d41697d4e95e3e97a6d3611c259781cb8211fa6cb57139b25fcfa3`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	322434 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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