PDF malware analysis — malicious · 385e31b0d268b71b

MALICIOUS

PDF

13.4 KB Created: 2011-04-13 21:08:42 Authoring application: dee kae

MD5: 997d108e3ee7c9080d327bb9fb891264 SHA-1: da28a8b9f47202c70a1e97a1b9eb93509ed4e599 SHA-256: 385e31b0d268b71b558994135ffbd07780ce261e8fab0a670e025cb1c32e3d04

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 heuristic firings indicating the presence of executable script and embedded files. Specifically, PDF_EVAL and PDF_UNESCAPE point to JavaScript execution, and PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT confirm that a script is embedded within an XFA form. The ML classifier strongly flags this as malicious. The primary IOC is the embedded file 'embedded_file_obj0018.bin', which is likely the 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_obj0012.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x15E0	84 bytes
`embedded_file_obj0010.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1692	228 bytes
`embedded_file_obj0003.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x1782	199 bytes
`embedded_file_obj0001.bin` `296b548a56e8701a7f81cb93514995154b77158ac5c74c65ec26a45dad369796`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1873	154 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1943	77 bytes
`embedded_file_obj0009.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x19E9	56 bytes
`embedded_file_obj0018.bin` `550adca458e2fb06f6d89a9d66691e2dff8ad7a5988f97ee16adc27de8678ea2`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x1D6B	21019 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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