PDF malware analysis — malicious · c815f9ed49385e94

MALICIOUS

PDF

105.5 KB

MD5: 0cfe448c137e7c367e15dfcd4006aea3 SHA-1: c0f6be6fff3df316d74f1200a8e01172add70241 SHA-256: c815f9ed49385e9400b2584d58a9373a3c62509ab39f306ee0eae1ffdae1a513

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1027 Obfuscated Files or Information T1055 Process Injection

The PDF exhibits multiple high-severity heuristic firings indicating malicious intent, including the presence of unescaped content, embedded script payloads, and risky executable scripts within an XFA form. The ML classifier strongly flags this PDF as malicious. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting a multi-stage attack where this PDF serves as a dropper.

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` `13405772e094a2a5506ded204bd1d3584b854545c9e6bad16c8aa45a2c52feda`	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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