PDF malware analysis — malicious · ddd49fdef1d9f3cb

MALICIOUS

PDF

12.8 KB Created: 2010-12-09 14:48:02 Authoring application: rep dib

MD5: 1af12f84af7be6485acfe3518ca5e0fc SHA-1: 12b6785551700fd0586a23a23cafe565637c3ed2 SHA-256: ddd49fdef1d9f3cbdecb2285d89eb43ca0d36a6bb34370b8274c22d9c36d97fd

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample utilizes XFA form features to trigger a heap spray exploit, as indicated by the 'PDF_XFA_HEAP_SPRAY' and 'PDF_XFA_SCRIPT' heuristics. The exploit code is embedded within a decompressed stream, and the 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. The ClamAV detection 'Pdf.Dropper.Agent-7313413-0' further confirms its malicious nature. The primary function appears to be dropping a secondary payload, likely through the embedded script.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

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.
ClamAV: Pdf.Dropper.Agent-7313413-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7313413-0
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_obj0011.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xDA7	84 bytes
`embedded_file_obj0019.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xE59	228 bytes
`embedded_file_obj0013.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xF4A	199 bytes
`embedded_file_obj0018.bin` `86956210b7fe00999ba093b42d221f1a7983565dd7ee5c0f12041e30facfe1aa`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x103B	119 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x10F1	77 bytes
`embedded_file_obj0017.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1198	56 bytes
`embedded_file_obj0003.bin` `0d02be19a0fead333768042aa335e8e3e3bd929307964fe2dbcd8a389b6389c2`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x14D0	11518 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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