PDF malware analysis — malicious · 35bd6362f1d81fb2

MALICIOUS

PDF

125.9 KB

MD5: 3b46189502d334372fdce70192312d0c SHA-1: 1eb041157951c8c0988ca08999b2313fe6b39bb5 SHA-256: 35bd6362f1d81fb2dd7842b3342411fa647daa66ab9cc65607968478edd78797

318 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The heuristics indicate that this JavaScript is used to launch further malicious activity, likely downloading and executing a second-stage payload. ClamAV detections on the file and an extracted artifact (legacy_pdfkit_stage_000.js) further confirm its malicious nature. The reconstructed URL from the script is "/vud.php", which is likely used to fetch the secondary payload.

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: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
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.
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_obj0008_000.js` `4e1e7ef957460104ce0ae1600cffe001e69b62a66510183a320bf473df366044`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1903 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `dbe28dce7d8ac64c36d42cc7f3cdeac5f74f6434b34431f812aec5e09e68982d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x98A	8412 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).

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