PDF malware analysis — malicious · 21c56d83d129d690

MALICIOUS

PDF

124.0 KB

MD5: 5b9999929f91b2cedc31fca561dabedb SHA-1: 7b0fbe4797d6e32093ddca4d34907223dda443eb SHA-256: 21c56d83d129d69049815a223df3cb34ae2c0e7b9a204f5e0aabac9036d07d18

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 and CVE-2008-2992. Static analysis identified these vulnerabilities through the use of `Collab.getIcon` and `util.printf` functions within the JavaScript. The embedded JavaScript streams, particularly `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`, are indicative of a multi-stage exploit kit designed to download and execute a further payload. The ClamAV detection of 'Js.Exploit.Shellcode-18' further supports this. The extracted artifacts suggest a downloader or dropper functionality.

Heuristics 6

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)
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 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `812b2f75d34f16a9c69752d623d8127380ed9f6af092eb9fdb9e785e2dc84800`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `1cfa4dc34ae7087875707389542543c795d6bf4888261f75c933c4c2347cd290`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA4A	1398 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `4c9267ee15697b58da1d64a4e17b0bbe5b6ae26335ef9842dc1f40714ef43fdb`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0xA4A	13795 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).

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