PDF malware analysis — malicious · 87c53a8c525abd07

MALICIOUS

PDF

3.4 KB Authoring application: Python PDF Library 055 http072057057pybrary056net057pyPdf057

MD5: 22286e0a820bf7c165f059a00e458376 SHA-1: f5c7ea063089bd7ea6e31e124bfd5b59f33156c1 SHA-256: 87c53a8c525abd07e9d1dd399bceb40f7c40df0f9f7c13778a03ca870fdf41e0

208 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that leverages the CVE-2009-0927 vulnerability (Collab.getIcon) to achieve code execution. The JavaScript is heavily obfuscated but appears to contain shellcode that is likely intended to download and execute a secondary payload from a remote location. The ML classifier strongly indicates maliciousness.

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. (matched in decompressed stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `4f7d3272c4aac0552f0ff6ec9d19a66abc24d45419ed10625c115c4cb502743c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2B9	5476 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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