PDF malware analysis — malicious · f494b766d8e1b5f4

MALICIOUS

PDF

5.0 KB Created: 2009-08-26 19:46:37 Authoring application: Eblasha 4.4.6.7 (via PDF Library 2.5.10.3)

MD5: 537dcbe64df0f78c84544329bbd18fb8 SHA-1: ea527d67d85cc57592f3246c576fa8dba18f37ef SHA-256: f494b766d8e1b5f46108551097b363872d341e36bebaeb6500eb7351d505cec3

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The sample is a PDF file that leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to execute embedded JavaScript. The extracted JavaScript, identified by ClamAV as 'Js.Exploit.Shellcode-18', is heavily obfuscated but indicates the execution of a second-stage payload. The PDF's structure and the nature of the exploits suggest a downloader or dropper functionality.

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` `8435556ac3f950376ca3003c4ffa78449b48e3b4bb5536d7876840f836868afd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	27049 bytes
`numeric_charcode_stage_000.js` `3db5f0974ea61fc9e723bd8356e7ab387daf2ce978d8fb8e4c0f1afd3cbf1ad7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	8286 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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