PDF malware analysis — malicious · 91fa9c000817b2e2

MALICIOUS

PDF

2.3 KB

MD5: a08c72630af203d370ed7958b368736b SHA-1: c5cb97f5b879196fb9e0c15983b7a0f2063480fa SHA-256: 91fa9c000817b2e2ccdab65e9a85c2a1db8c69d26d4a866c80b6598ebb8dbf22

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2008_2992 heuristic firing suggests the exploitation of a vulnerability using `util.printf`. The presence of multiple JavaScript streams, one of which is quite large, points towards the execution of malicious code. The ClamAV detection as Pdf.Dropper.Agent-7283122-0 further confirms its malicious nature. The script's likely intent is to download and execute a second-stage payload, leveraging the identified PDF vulnerability.

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: Pdf.Dropper.Agent-7283122-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7283122-0
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj263984_000.js` `8addd0d33fbac81c788afe127a51aed354b4ca7f8b7fa6d9602ee7e98da2f1f2`	pdf-javascript-stream	PDF /JS object 263984 at offset 0x197	6904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`javascript_obj263985_001.js` `ba60b29f532359ee85882b0ddb043c6a8a445f53a6b8ccbab1964cb9198a3355`	pdf-javascript-stream	PDF /JS object 263985 at offset 0x6B3	156 bytes
`javascript_obj263986_002.js` `c9ab9134b00f43fac90adc28815dc1c79ed34440571780db6a7ff40ebe1ea891`	pdf-javascript-stream	PDF /JS object 263986 at offset 0x786	526 bytes

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