PDF malware analysis — malicious · a256b0bbe8b346ea

MALICIOUS

PDF

2.4 KB Created: 2008-31-20 45:83:00 Authoring application: Neon v.1.0.5 ru (via Neon v.1.0.5 ru PDFLib)

MD5: 87d6f6855b91609e41263cf06309e425 SHA-1: c0b216ff7d434f5eea0efd129b6303b9ee68d60f SHA-256: a256b0bbe8b346eab4811fe0ae922d6bb9d36d32e660f9e67970a9004ac40d17

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript triggered by an OpenAction, a common technique for exploiting PDF reader vulnerabilities. The critical heuristic firing for CVE-2008-2992 indicates a specific exploit is present. The embedded JavaScript, identified as javascript_obj0013_001.js, is likely responsible for downloading and executing a secondary payload, although its exact functionality is obscured by obfuscation.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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_obj0013_001.js` `733e455004070d509711b3919b7d5f1e1f66e0d082dc410fecf89f8d9510061c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x367	2307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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