PDF malware analysis — malicious · b1f0b574da2a9a31

MALICIOUS

PDF

4.1 KB Created: 2009-09-03 19:46:87 Authoring application: Eblasha 9.1.1.8 (via PDF Library 8.4.5.4)

MD5: 11dbb8d7924595e24c61eca8c9248834 SHA-1: 0efc38ac6df5f97d1909aaea2c8b79898d169292 SHA-256: b1f0b574da2a9a31e15b220a1c39e687a2ae71802da526e9bc7e9375ac5a6a14

326 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

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 ClamAV detection of 'Pdf.Dropper.Agent-5343187-0' and the suspicious extracted JavaScript artifact 'numeric_charcode_stage_000.js' further support this. The embedded JavaScript is likely designed to download and execute a secondary payload, as indicated by the 'Js.Exploit.Shellcode-18' signature on the extracted artifact.

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.Dropper.Agent-5343187-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343187-0
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj0013_000.js` `d0b344948712e064a1e94acc4d50097c9b226d6124bf592dfc948ff3cab9b371`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	16732 bytes
`numeric_charcode_stage_000.js` `c3bf77623aa45f9a94d5446d62a00871e2a4300524f19b2d13a3271f09c47615`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	5028 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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