PDF malware analysis — malicious · 7d9d4de7cbdb8fe7

MALICIOUS

PDF

103.5 KB

MD5: 2039f1982f18fcf2008963c8e90b4da0 SHA-1: 1bc609cd65f51ba1bd128858f513aeeaa05e7fe6 SHA-256: 7d9d4de7cbdb8fe70fff68456ca68e3dc958218c4c4544b94e79c2df2d1f3f1a

170 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains multiple high-severity heuristic firings indicating embedded script payloads and XFA forms with risky executable scripts. The ML classifier strongly flagged this as malicious. The presence of an embedded file, 'embedded_file_obj0008.bin', suggests a downloader or dropper functionality. The unescape() call and ASCIIHexDecode filter point towards obfuscation techniques used to hide malicious JavaScript.

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` `3d8113d1b945d8715b3dd141cc4a12706d958c2754b6e836224f6f95a373c2fd`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15034 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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