PDF malware analysis — malicious · 56ad53b235fa0141

MALICIOUS

PDF

104.7 KB

MD5: de187c959c5618c7cf5053b3d89b2e5f SHA-1: 95235939e37d6cbdb0d26201ad66855f8f478bba SHA-256: 56ad53b235fa0141d2b0ff7d5e8c874616466cf212a45423bdb5b3b35abebe43

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF exhibits multiple high-severity indicators of maliciousness, including XFA form usage with executable scripts and the presence of an unescaped stream. An embedded file, 'embedded_file_obj0008.bin', was also detected. These factors strongly suggest the PDF is intended to exploit vulnerabilities and download a secondary payload, although the specific nature of the payload is not detailed in the provided evidence.

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` `be226a474bee2b2aa778a9c4db0719be378bdb2bacef7db666c7617d9ac496e4`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15202 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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