PDF malware analysis — malicious · 0cf666b280d51fd5

MALICIOUS

PDF

1.5 KB

MD5: a0b6dacf01a3a715d840785e7724a8f7 SHA-1: d555dbbba6416d7469609ed5ed1a8029f3ac17b6 SHA-256: 0cf666b280d51fd5a6945162959ab3640ab12163cf4d6783135e83ef3415bb1e

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0927, specifically targeting the Collab.getIcon function. The deobfuscated JavaScript appears to construct a URL, likely for downloading a secondary payload. The ML classifier strongly indicates maliciousness, and the exploit cluster confirms the presence of exploit code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `f784a9d98190cc140f930e687bacf1cb71d71cad68a85b8d22324c3a37f37340`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2210 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`combined_document_js_000.js` `7d8167768427a7b7531f0fae9414499249786c3239c56163f65f17e269e5cbdb`	deobfuscated-js	combined document JavaScript streams at offset 0x160	2242 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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