PDF malware analysis — malicious · c33ed7212291cc83

MALICIOUS

PDF

103.3 KB

MD5: 1896625cae5dcb39f91eec1bc9142c07 SHA-1: 04d0e48ffa616d5532257c6439ff85a0b810c55b SHA-256: c33ed7212291cc83f8ac86442df64beea4293c6ae072689f2f4c3fd3cc22eec9

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF sample exhibits multiple high-severity heuristic firings indicating malicious intent, including the presence of unescaped content, embedded script payloads, and risky XFA form scripts. The ML classifier strongly flags this as malicious. The primary attack vector appears to be exploiting PDF vulnerabilities to execute embedded scripts, as evidenced by the 'PDF_UNESCAPE' and 'PDF_XFA_SCRIPT' rules. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting a multi-stage attack.

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` `5919b7988d7a69971f94264406ec792fceb03e407578450498f99f8c8ce0863e`	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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