PDF malware analysis — malicious · 43ebd4f77c1da1d7

MALICIOUS

PDF

14.7 KB Created: 2011-03-24 19:00:44 Authoring application: ado aal

MD5: 0d5fd07451e7ff4bb92944be04deebdc SHA-1: 7e8a280d36707f41c23595d98f19b6de212876c6 SHA-256: 43ebd4f77c1da1d7f4f9981522b1a3b7841a764bd7c8e78b791c444ec8a383a7

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF sample exhibits multiple high-severity heuristic firings, including PDF_EVAL, PDF_UNESCAPE, PDF_EMBEDDED_SCRIPT_PAYLOAD, and PDF_XFA_SCRIPT, indicating the presence of executable script content within an XFA form. The ML classifier also flagged this as highly malicious. The embedded script is likely responsible for downloading and executing a secondary payload, as suggested by the embedded file artifact 'embedded_file_obj0005.bin'. The exact nature of the script's execution is obscured, but its presence strongly suggests a malicious intent to compromise the user's system.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj0002.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1AEC	84 bytes
`embedded_file_obj0011.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1B9E	228 bytes
`embedded_file_obj0013.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x1C8F	199 bytes
`embedded_file_obj0012.bin` `2c7eac2ce238224d10901e064bdf1a1601a942c2655ccb63e881f4623ae4c72a`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x1D81	154 bytes
`embedded_file_obj0006.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x1E52	77 bytes
`embedded_file_obj0017.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1EF9	56 bytes
`embedded_file_obj0005.bin` `1d2c21778bd7668f1c6addc77b0251fb0b987f849ba2da95f3df70ce94146bee`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x2278	20930 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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