PDF malware analysis — malicious · ffd9b8f6716b6aac

MALICIOUS

PDF

13.7 KB Created: 2011-04-18 16:51:46 Authoring application: ban ays

MD5: f70c8348f8071647bdf6d441804b6834 SHA-1: e83ef295a4e6a0232e8d40864ab14b82741d9545 SHA-256: ffd9b8f6716b6aacf0eeaee7dfb2cf0296b418592c00f2b8f52626c85968f2c0

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF sample contains multiple high-severity heuristics indicating the presence of executable script and embedded files. Specifically, the PDF_EVAL and PDF_UNESCAPE heuristics point to the use of JavaScript for obfuscation and execution. The ML classifier strongly flagged this PDF as malicious. The embedded script payload and the embedded file artifact suggest the document is designed to download and execute a second-stage payload.

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_obj0019.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1754	84 bytes
`embedded_file_obj0015.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x1806	228 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x18F7	199 bytes
`embedded_file_obj0005.bin` `ffe372912fe818e76a0308796a66f480a7740aa3594be223289ed8dfcfa0d0fe`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x19E8	154 bytes
`embedded_file_obj0008.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x1AB9	77 bytes
`embedded_file_obj0009.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1B5F	56 bytes
`embedded_file_obj0017.bin` `f3e34f2dc269649123046801e943dc15c7177bddd0b17ef80e6f86fca8ce7fe1`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1EDF	20453 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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