PDF malware analysis — malicious · a651541262e1849f

MALICIOUS

PDF

105.5 KB

MD5: c1ee2d0af5180ef5120d7f1259c68de4 SHA-1: 6565210a32b48bfb7af694b03ce86e496dcfdf07 SHA-256: a651541262e1849f802755d9fd2a1a08b0be815634c1aeecc7105e536a30f409

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF sample was flagged as malicious by an ML classifier with high confidence. Heuristics indicate the presence of embedded scripts and the use of PDF-specific obfuscation techniques like unescape() and ASCIIHexDecode. The embedded file 'embedded_file_obj0008.bin' is suspicious and likely contains the secondary payload. The XFA form also contains executable script, suggesting an exploit is being leveraged.

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` `8babd18a5d339a2418a28d06be61a4e49213c5960f769b1d880cf5ed7168ec48`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15322 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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