PDF malware analysis — malicious · 4868e451049c0f42

MALICIOUS

PDF

4.0 KB Created: 2009-09-02 19:42:44 Authoring application: Eblasha 5.1.9.2 (via PDF Library 1.5.1.2)

MD5: 541e9691816fecdeb59204d92e846240 SHA-1: aa29529de148e25962c712cd16a8b670208768f2 SHA-256: 4868e451049c0f42c76e2c49a8ca4cd0a45f75b910f736c133a29733a8c6e329

364 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The deobfuscated JavaScript file, 'numeric_charcode_stage_000.js', was also flagged as suspicious by ClamAV, suggesting it is a malicious component. The primary function of the embedded script appears to be the execution of shellcode, likely for downloading and executing further malicious content.

Heuristics 9

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-30204 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-30204
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` `9c94c4166ff2cbc8b772b0bc7b4bc49de0ec25a11784013131ea7cb3b6c88dae`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	16447 bytes
`numeric_charcode_stage_000.js` `4056651f3268beafa910e1f6237a7b774169264b2842a1f0ad0778955aa44c1e`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	4938 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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