PDF malware analysis — malicious · 53c9154b5ca0e6cd

MALICIOUS

PDF

14.4 KB Created: 2011-04-14 20:42:14 Authoring application: dee kae

MD5: 005d3b73daf43026893403f55b759780 SHA-1: 944cb94f9e4744397adbc56392301c2f81e82990 SHA-256: 53c9154b5ca0e6cd7c3b6488a17767c1e19a3834d230bb3b568b7a9e6f239fa0

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exhibits high-confidence indicators of maliciousness, including PDF_EVAL and PDF_UNESCAPE calls, suggesting an attempt to execute embedded JavaScript. The ML classifier strongly flagged this sample as malicious. The presence of an embedded script payload and the ML_NYX_PDF_MALICIOUS heuristic indicate the document is designed to exploit vulnerabilities and likely download a secondary payload, as evidenced by the suspicious embedded file artifact.

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 0x1A2F	84 bytes
`embedded_file_obj0010.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1AE1	228 bytes
`embedded_file_obj0003.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x1BD1	199 bytes
`embedded_file_obj0001.bin` `7155f54ca1f87945f21dc2f955ea9dbe1afae7c13d375c988f60173a99d074f4`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1CC2	154 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1D93	77 bytes
`embedded_file_obj0009.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1E39	56 bytes
`embedded_file_obj0018.bin` `091cdc387e68d6295caa68a364531caf7b3f23c03d79b757deb2e6f94696ef83`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x21BB	20628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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