PDF malware analysis — malicious · 8e3e4982800fc863

MALICIOUS

PDF

69.7 KB

MD5: 08f28daa89690fabcb90cc38c63d70ce SHA-1: 8f59136b1bac693caf896d2535895e21af688729 SHA-256: 8e3e4982800fc863ad9e0e4136808ad9017aa478da8ef8574beb4ca8634e0efb

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded and obfuscated JavaScript. An extracted artifact, 'legacy_pdfkit_stage_000.js', was flagged by ClamAV as 'Js.Exploit.Shellcode-18'. This suggests the primary function of the PDF is to leverage these vulnerabilities to download and execute a secondary malicious payload. The obfuscated JavaScript is too complex to fully reconstruct its exact actions, but the exploit firings strongly indicate a downloader or initial access pattern.

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` `f1916997179e0e450667d274f0651c5047a47e15a184ff0f072c8f582243be2d`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2105 bytes
`legacy_pdfkit_stage_000.js` `045518b5d2528577a99478a4ee42221cb398fddde352f769a61e51f91dc8c1d3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA54	4560 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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