PDF malware analysis — malicious · 398dfe3800e662f2

MALICIOUS

PDF

105.6 KB

MD5: e335e0cbf53ae86fc755a82998bd54c8 SHA-1: 289d6fda48cf98364ba7d3bb0eb1e68c6b53bce0 SHA-256: 398dfe3800e662f28df54030e67fb9deddacae576158fba81cf89dc1e42e4a8f

170 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1027 Obfuscated Files or Information T1059.007 JavaScript/VBScript

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed the presence of an embedded file and risky executable scripts within an XFA form, indicating a potential exploit delivery mechanism. The use of PDF_UNESCAPE and PDF_FILTER_HEX suggests obfuscation techniques were employed to hide malicious content. The embedded file 'embedded_file_obj0008.bin' is likely the delivered payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `b5c9f0cda5e4bdaf0a29fcc80c7b20ae3fbe3d2c0dc0c198dc9ed6c7ed120826`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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