PDF malware analysis — malicious · 7c9661ffcb8f2aa6

MALICIOUS

PDF

4.1 KB Created: 2009-09-03 19:46:06 Authoring application: Eblasha 9.8.8.6 (via PDF Library 1.3.1.9)

MD5: d6f8faf5db3c9f482b782fb47ead4848 SHA-1: 399c44687f76507cdb065db851c978def83e4440 SHA-256: 7c9661ffcb8f2aa6fe4a53f7878040d886ba080c271895cc843393ec47eb08e2

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The JavaScript, identified as 'numeric_charcode_stage_000.js', is heavily obfuscated but detected by ClamAV as 'Js.Exploit.Shellcode-18'. The script's primary function appears to be downloading and executing a second-stage payload, indicated by the exploit signatures and the nature of the vulnerabilities targeted.

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.
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` `062cdf2cf5081eef6aabc86cc979e3398ddba31f970a0929b647fb0ae6a0299a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	16732 bytes
`numeric_charcode_stage_000.js` `7b992722c11670f754707ddbacc943618aa2e7d2e9c90729e60083bcaef56204`	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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