PDF malware analysis — malicious · 3f3b6d5e94654996

MALICIOUS

PDF

180.4 KB

MD5: e729bcd264021638f75e7a594ce5d0d1 SHA-1: 68bd2c7e0ec48b709ad9d82f1cb1f583a51c10ba SHA-256: 3f3b6d5e94654996d1f7e971e240aef04d4a71ec76d5bd16d76898e6c6f77812

318 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 JavaScript/VBScript: JavaScript

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. ClamAV detections further confirm its malicious nature. The embedded JavaScript, despite some obfuscation, is indicative of a downloader or exploit loader, likely attempting to fetch and execute additional malicious content. The extracted JavaScript files, particularly 'legacy_pdfkit_stage_000.js', are large and complex, suggesting a multi-stage attack.

Heuristics 8

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. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36117 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36117
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `12bda4bbb517dc387fff25116b87586a803a7f8897ec8e089abe3d33c6875545`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2674 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `2895529cfdab7e5074dd263d199429cbd8cf862acbacf93889856330690d7b04`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC8D	20141 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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