PDF malware analysis — malicious · ec7fcf1cc4b492c1

MALICIOUS

PDF

105.6 KB

MD5: 9b20fc6730fee5525a5bcf3e8c45cfb1 SHA-1: 6ae11229eab6d9bb049853479dfb84a551353116 SHA-256: ec7fcf1cc4b492c1d2e9e1731088e78048e39e4f37a364930603eac8a1a1376e

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.007 JavaScript/JScript

The PDF file contains embedded content and utilizes XFA forms with risky executable scripts, indicated by multiple high-severity heuristics. The ML classifier strongly flags this PDF as malicious. The presence of an embedded file suggests a downloader or exploit delivery mechanism. The unescape() call and ASCIIHexDecode filter are common obfuscation techniques used to hide malicious JavaScript payloads within PDF streams.

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` `65ac218f7a5d055a1195c6a52bec6a05c15047379f632ee103c7244341aa7915`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15334 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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