PDF / .TMP malware analysis — malicious · 764a33d900f836bd

MALICIOUS

PDF / .TMP

1.95 MB Created: 2009-06-02 09:07:08 Authoring application: VrtVKVNNLQhctsyJ (via enUhRQGXSoYoEaaQgT)

MD5: d5f2df3055ea78a6f18bc8c69ff8ae72 SHA-1: a1379aed275ad23d71493de704abe75791091eeb SHA-256: 764a33d900f836bde10d616168e42914ec35f68b80d4faabbbab96c3941b4956

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS_EXPLOIT_CLUSTER'. The JavaScript is obfuscated but appears to be designed to download and execute a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection as 'Pdf.Exploit.Agent-35572'. The primary attack pattern is likely spearphishing attachment, leading to client-side exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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.
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_obj0007_000.js` `66f3db93767f730d23ac375397a9e768bde7b7f955a6eb5ea9a0c39cc15120d4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x444	7715 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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