PDF malware analysis — malicious · 33acfa65d80a023f

MALICIOUS

PDF

164.0 KB

MD5: a695660b462a3d3d2f63d3dd51d67f46 SHA-1: bd04ef8d84dd53b8bf95599126b18b2e0d3b4e0c SHA-256: 33acfa65d80a023f1281c5de949916bf711b129c4410034c384a60307b872d73

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to execute arbitrary code. The extracted JavaScript stream, identified as legacy_pdfkit_stage_000.js, was flagged by ClamAV with 'Js.Exploit.Shellcode-18', indicating it likely attempts to download and execute a secondary payload. The obfuscated nature of the JavaScript and the use of multiple exploit techniques suggest a downloader or initial access stage for a more complex attack.

Heuristics 7

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.
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` `cdfe2c50211986a3aeb2dc35f54ee556860f6b9f685c80411e1edd8a0dfcbc10`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3145 bytes
`legacy_pdfkit_stage_000.js` `e231d60377f7b2e9d37667a8d462a7d63caa7909a4cf3bb1938e5e2e3e384c59`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xE64	10928 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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