PDF malware analysis — malicious · 8ffbedb262559362

MALICIOUS

PDF

3.9 KB Created: 2008-05-25 19:30:48 Authoring application: Adobe (via UltraEdit)

MD5: 5fa7c549767fa76946af728bcdafd73c SHA-1: bbef103d0dcd6be92f5a8b86283b31c8c2a288ce SHA-256: 8ffbedb2625593624b890ed5f27026bcdc8dae793a57bf0e6f724fb52d55934a

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF sample contains embedded JavaScript that leverages known vulnerabilities (CVE-2009-0927 and CVE-2007-5659) to achieve code execution. The embedded JavaScript stream, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but ultimately detected by ClamAV as 'Js.Exploit.Shellcode-18'. This indicates the script's purpose is to download and execute a malicious payload. The use of `eval()` and `unescape()` functions within the JavaScript further supports this conclusion.

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)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj0006_000.js` `c418d4d476ccacd8ff49c2acbea8e8198f46668a810efa2f31ccdad6eb45b0c5`	pdf-javascript-stream	PDF /JS object 6 at offset 0xCCA	239 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e97c6f06e5acf6bf53eaa366c1753b5071431fb971f39dc52d6fd792312621b5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x16C	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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