PDF malware analysis — malicious · c12184170f500a36

MALICIOUS

PDF

105.6 KB

MD5: 1745353b374e6b74462a15b8fa0c0093 SHA-1: e58145568bab9b095e2240e61ef7b59eafb21775 SHA-256: c12184170f500a3626d6948eb53c85e3c5a2bcdea3cf2ae96bf16aacd4609d8c

168 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample was flagged as malicious by an ML classifier with high confidence. Static analysis revealed multiple indicators of malicious PDF construction, including the use of unescape() calls and ASCIIHexDecode filters, suggesting an attempt to obfuscate malicious content. An embedded script payload was detected, and an embedded file artifact was extracted, indicating the PDF is likely a dropper or exploit delivery mechanism.

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` `fe20dd14ac185f43441a1c6c7d6782c31004b2c3e449a5bd5648ced5a42b4467`	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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