PDF malware analysis — malicious · b3a58742f79cb145

MALICIOUS

PDF

3.1 KB

MD5: acf182fb818f5e33894e8a1b96f588e5 SHA-1: 3c0bac066b124337841b97506335ea69a7596ede SHA-256: b3a58742f79cb1451aef5f0b435c95be092d154aecf03038b8a514928eac4826

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2008_2992 heuristic firing confirms the use of a known exploit (util.printf) within the JavaScript stream. The unescape() call further suggests obfuscation of malicious code. The primary intent appears to be the execution of this exploit to download and run a second-stage payload, as evidenced by the suspicious extracted JavaScript artifact.

Heuristics 5

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)
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_obj0005_000.js` `ad2d07d94521ea989aae1e519a744cf7278ea2c4b5b0cd097d713bc74dd6336c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	5632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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