PDF malware analysis — malicious · 36a6b1fd26ef00f8

MALICIOUS

PDF

4.0 KB Created: 2009-08-14 19:46:23 Authoring application: Eblasha 10.9.1.6 (via PDF Library 1.2.3.1)

MD5: 6fa1bb168901f03fb7a3495287a419c7 SHA-1: 770fe070d95aa6045a83952c943a68168aeaa1ff SHA-256: 36a6b1fd26ef00f8282518c938fbbe8c466e2356d620cb7b2416d809791dd997

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages multiple CVEs (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to achieve code execution. The embedded JavaScript stream, when deobfuscated, is detected by ClamAV as Js.Exploit.Shellcode-18. The primary attack vector appears to be exploiting these known PDF reader vulnerabilities to download and execute a secondary payload.

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 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.
Suspicious extracted artifact high 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.
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `44a97f5993f3f3e09e3133cca94a0a42c5b7af1c8ce2c11806dda0954451098c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	15877 bytes
`numeric_charcode_stage_000.js` `15fe31beb9a76c6b0e5feb58818fde493fdd7042a48653543c11b4f5e439faae`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	4758 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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