PDF malware analysis — malicious · 7d8dd61702f09e89

MALICIOUS

PDF

3.6 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: 2cfcf7dfd18a9ff73d69192b7a1f31fc SHA-1: 7688f492dae2a1e8c7f47aa37f663c4c7fce46f1 SHA-256: 7d8dd61702f09e89368d1df985583c6bc3e24222a5777cbac940a6212335e628

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes `unescape` and `eval` functions, indicating an attempt to obfuscate and execute malicious code. The script reconstructs a string from the document's title, which is then deobfuscated and evaluated. This pattern is commonly used to download and run further malicious content, as suggested by the ClamAV detection and ML classifier.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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-35931 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35931
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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` `9656e50f7adf78f3dfd40eb407f596c734aaee667d97fc2da8a5ba2b2ecd5467`	pdf-javascript-stream	PDF /JS object 6 at offset 0xBC4	225 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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