PDF malware analysis — malicious · 95d3d149716dba7e

MALICIOUS

PDF

14.3 KB Created: 2011-04-06 16:35:17 Authoring application: yup axe

MD5: 237cdf1c644837243a87c242578259a9 SHA-1: 396444ed855ca55481a4537696746db8fdb44a91 SHA-256: 95d3d149716dba7e732ee91bbaa610f31f5857c7bb9d2bd9f7d2c5db0f2f9ff2

198 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 a risky script is embedded within an XFA form. The ML classifier strongly flags this as malicious. The embedded file obj0015.bin is likely the second-stage payload. The script's intent is to download and execute this 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_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x18BE	84 bytes
`embedded_file_obj0018.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x1970	228 bytes
`embedded_file_obj0004.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1A60	199 bytes
`embedded_file_obj0005.bin` `296b548a56e8701a7f81cb93514995154b77158ac5c74c65ec26a45dad369796`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1B51	154 bytes
`embedded_file_obj0011.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1C22	77 bytes
`embedded_file_obj0002.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1CC8	56 bytes
`embedded_file_obj0015.bin` `a7a2dc1bfd934bd3e6a148e19e13160c6959022acef4c3c66bb5ecdbc73b21f4`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x2046	21207 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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