PDF malware analysis — malicious · f8f303b3a4863809

MALICIOUS

PDF

13.8 KB Created: 2011-04-01 12:32:12 Authoring application: sax wit

MD5: 1cded36f2b0c7bd3e7b0d77cb6934b41 SHA-1: 028cc999f5beea1449e406afa76d5fcaf340fbcc SHA-256: f8f303b3a48638093adc505a51b9f4ffcc42b8ef753dfadd90745b602504b043

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

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 malicious JavaScript. The ML classifier strongly flags this PDF as malicious. The embedded file 'embedded_file_obj0019.bin' is likely the secondary payload. The XFA form and script execution suggest an attempt to exploit a PDF vulnerability for initial execution.

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_obj0010.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1808	84 bytes
`embedded_file_obj0004.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x18B9	228 bytes
`embedded_file_obj0014.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x19AA	199 bytes
`embedded_file_obj0011.bin` `077544d1d242d3f07a8f9594ab98e09359c5d4bfddcf16c41ad4281ff087fa3b`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1A9C	154 bytes
`embedded_file_obj0017.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1B6E	77 bytes
`embedded_file_obj0002.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1C14	56 bytes
`embedded_file_obj0019.bin` `d093e817ac4608c9716953984b03b6e4b743e542d7e65957d699e6faafd7d1a8`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1F90	20442 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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