PDF malware analysis — malicious · b231be27d4e75f61

MALICIOUS

PDF

105.6 KB

MD5: d5a68f5ecf7f8026d7a91806edcbb394 SHA-1: 8cacb9b16bb03b441b092898062c88a0b69ad7ac SHA-256: b231be27d4e75f613fbf5c71e4b5f117107ec9f6754bc4645649e943c9fbe60f

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.007 Abuse Execution: JavaScript Execution T1566.002 Phishing: Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains XFA forms with executable scripts, and an embedded file object. The presence of PDF_UNESCAPE and PDF_FILTER_HEX heuristics indicates obfuscation techniques commonly used to hide malicious payloads. The embedded script payload is likely responsible for the malicious behavior, potentially downloading and executing further stages.

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` `352002d4e0df648ebe96e39d02fda73ada6656420f0a21a12cf24e8d5632f324`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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