PDF malware analysis — malicious · b5d99bc8c4f12efc

MALICIOUS

PDF

11.8 KB Created: 2010-12-01 15:58:15 Authoring application: tae poi

MD5: ceb5dccde1010748d14cbc7fca6fd413 SHA-1: 1f71565fa5757e521d828609240a92aa5d389f1a SHA-256: b5d99bc8c4f12efcd94e87a7d271aa6ba5d73087540a40c216d7acf9e76aeccc

210 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

This PDF sample contains critical XFA JavaScript heap-spray exploit code. The ML classifier strongly indicates maliciousness. The exploit likely targets a vulnerability within the XFA form processing to execute arbitrary code, with the embedded file 'embedded_file_obj0007.bin' being a strong candidate for the payload. The presence of unescape() calls and embedded script payloads further supports this attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj0013.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xA32	84 bytes
`embedded_file_obj0019.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xAE4	228 bytes
`embedded_file_obj0012.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xBD5	199 bytes
`embedded_file_obj0010.bin` `a4a21f4f68a5bbf8d9751a0f8480b38ae87f2432c80682ac15207bbaec9ed1c3`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xCC6	119 bytes
`embedded_file_obj0017.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xD7D	77 bytes
`embedded_file_obj0001.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xE23	56 bytes
`embedded_file_obj0007.bin` `583e20ebe91d41a6b56c9f10b6b6216e47082642cb715ffc635fe0fc2cbdf6de`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x115C	11548 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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