PDF malware analysis — malicious · 833c4debc2700476

MALICIOUS

PDF

12.9 KB Created: 2010-12-07 21:17:14 Authoring application: gin wed

MD5: f525d4485d6f4e85d7368c83545cfe33 SHA-1: 7438fbf2dc13e165df9263ebd52a425ac9bf8158 SHA-256: 833c4debc27004769f1ae0f2db3892cf880d6dec2b3a406bc635fa0606ce834f

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Script

This PDF sample contains critical XFA heap spray exploit code and risky executable script within its XFA form. The ML classifier strongly indicates maliciousness. The presence of an embedded file, specifically 'embedded_file_obj0004.bin', suggests it serves as a payload or part of the exploit chain. The script's purpose is to leverage the heap spray to execute arbitrary code, likely downloading and running a second-stage payload.

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_obj0014.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xEB5	84 bytes
`embedded_file_obj0008.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xF66	228 bytes
`embedded_file_obj0002.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1056	199 bytes
`embedded_file_obj0010.bin` `7951c39ce3edc99596c46e6024ed080a0a8044f35731dfff2478f11355425452`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1147	119 bytes
`embedded_file_obj0003.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x11FD	77 bytes
`embedded_file_obj0009.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x12A3	56 bytes
`embedded_file_obj0004.bin` `500fa581f2b6bd20d23fb39ff200cb2c25c598507aa394c046b91d9ede4f3cda`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x15DB	11353 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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