PDF malware analysis — malicious · d23bd7c82e405026

MALICIOUS

PDF

11.8 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: c38c4e73365db243a046b2e63a346fbf SHA-1: a0b2bdd1342af298359cc0abc61dff53c6657000 SHA-256: d23bd7c82e405026433ae3cbbfc4189ecc6b967248fca8753b16b86fef5ec0bf

228 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35541. Static analysis revealed multiple high-severity heuristics related to JavaScript execution, including eval() and unescape() calls, indicating obfuscated code. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be exploiting a PDF vulnerability to run embedded JavaScript, which is likely responsible for downloading and executing a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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_obj0027_000.js` `449e0d0d4b5889b1c48cc753e17d9f9499beb9e7a953abc68b17cb452909b0d6`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	64002 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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