PDF malware analysis — malicious · db1409e95f82a641

MALICIOUS

PDF

104.7 KB

MD5: 357b6c1250277d5ad1d9d4a632cbd927 SHA-1: 49688b6b8821908fbd01722e98f53be438fa276b SHA-256: db1409e95f82a6413dc8ad000d957a19878c2c1ce1f73e76088d5bf0747c6116

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.007 Abuse Elevation Control Mechanism: JavaScript

The PDF file exhibits high-confidence malicious indicators, including the presence of XFA forms with executable scripts and the use of PDF unescaping and hex decoding, suggesting an exploit attempt. An embedded file, 'embedded_file_obj0008.bin', was also extracted, likely serving as the secondary payload. The ML classifier strongly supports a malicious verdict.

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` `838fde23cd1ae37267a9635a4e5ad248934673d82e57a0256217e907c6e74377`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15214 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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