PDF malware analysis — malicious · bfac4263361c7528

MALICIOUS

PDF

103.3 KB

MD5: bf3cff25765c7d7a5f41b01ca3838cca SHA-1: b6455cdf2a6bf0f7dbcdd8bfec3abba21edd97dc SHA-256: bfac4263361c7528c18c4b43186a71b2d089c9e74a6b2e9c607c3c6513c5ff6f

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF sample contains multiple high-severity heuristic firings indicating the presence of executable script content and an embedded file. The ML classifier strongly flags this PDF as malicious. The embedded file, named 'embedded_file_obj0008.bin', is likely the primary payload. The XFA form and PDF unescape/hex decode filters suggest obfuscation techniques were used to hide the malicious content.

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` `736f6cd541c5fc90e378a7e2c8765a4a184dcfd4f7007e17bc4be2fcac3b25ed`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15010 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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