PDF malware analysis — malicious · cc8a486fd61983c0

MALICIOUS

PDF

105.5 KB

MD5: 391a7595ae00eb580033179ffa7bd1a7 SHA-1: 4c593e0ae31f1a0879b3f48ec301b28a109c2f31 SHA-256: cc8a486fd61983c0138f74ba16df973b00eb61a289adbfc8703b907d06dfddc3

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains an embedded script payload, indicated by multiple high-severity heuristics including PDF_UNESCAPE, PDF_EMBEDDED_SCRIPT_PAYLOAD, and PDF_XFA_SCRIPT. The ML classifier strongly flags this PDF as malicious. The embedded script is likely responsible for executing the malicious payload, although its exact function cannot be determined due to obfuscation. The primary IOC is the name of the embedded file.

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` `c4d196b9636116f201601a92f982fe3ccefed98135d9ccac5c4cf2a41aabd3e6`	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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