PDF malware analysis — malicious · 772cab1973e2e572

MALICIOUS

PDF

12.1 KB Created: 2009-11-23 19:48:44 Authoring application: PDF Library 2.5.5 (via PDF Library 4.6.3)

MD5: 20a0d0601ff81963d63214a542986d2a SHA-1: b669e42f6fe84489e44d1037ff5d3e43ce5e6f70 SHA-256: 772cab1973e2e572d5589a097538d1d2fcfbaf2e6022daf3a0b23a5e784cf9e2

278 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript

This PDF exploits multiple known Adobe Acrobat vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by leveraging embedded JavaScript. The heuristics indicate that the JavaScript is obfuscated and likely decodes a second-stage payload, as confirmed by ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact. The attack pattern involves luring the user into opening the PDF, which then triggers the exploit.

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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `64a543db70691624260d89b67db467db1809e31c6d7dd9eb06f00073b51c7d13`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37777 bytes
`legacy_pdfkit_stage_000.js` `7bca7993829fc59b156538e7e1088134bdd8f1ded386bc7a8451e712fc342c74`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9880 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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