PDF malware analysis — malicious · aa12b5154d50a7a6

MALICIOUS

PDF

5.8 KB

MD5: ae9794198fee4d24bc2f69f5bf6c4eb1 SHA-1: c019e59414f7dda630f8b29f81e96c526abf6789 SHA-256: aa12b5154d50a7a697c6bdbc6ddba318339bda83e1096c6c18c126a01ad4ddc0

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the use of util.printf, which is associated with CVE-2008-2992, a known PDF vulnerability. The embedded JavaScript stream was obfuscated and required unescape() for decoding. The primary intent appears to be the exploitation of this vulnerability to execute arbitrary code, likely to download and execute a second-stage payload.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0006_000.js` `3443b86af589de2dfca1b7265374fc966367ea272507c85b7760e32f839d67c8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x199	4985 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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