PDF malware analysis — malicious · 8ca36d55d376a85b

MALICIOUS

PDF

18.4 KB Created: 2010-08-20 15:29:18 Authoring application: bullHuh riffHuh

MD5: f2299e2aab10998922286d48cfe97940 SHA-1: 941504dff701324a8a9ac260a26aec0f79a5d908 SHA-256: 8ca36d55d376a85b0e761b66a43a19cc823535dc7eb7dbb9b534cf30650ab1ca

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

This PDF sample contains critical heuristics indicating an XFA heap spray exploit. The exploit code is embedded within a stream and triggered by an XFA event, aiming to execute malicious JavaScript. This script is likely designed to download and execute a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'ML_NYX_PDF_MALICIOUS' firings. The presence of an embedded file, 'embedded_file_obj0010.bin', further supports this. The exact nature of the payload is not discernible from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x125D	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x130E	228 bytes
`embedded_file_obj0010.bin` `aaa0943597cb91c307969d001f433e57c97daaac47ad31c61c66b4fa4b976215`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1401	24825 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4152	199 bytes
`embedded_file_obj0012.bin` `e93f3baf45c6b4a1f293cef1eb7d223472116c4b9eb1643e05e98f79255b95fb`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x4243	131 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x4301	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x43A8	56 bytes

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