PDF malware analysis — malicious · 93374a5862bde25e

MALICIOUS

PDF

103.5 KB

MD5: 340a7dcc93bc7db9e2fac684eb06bd83 SHA-1: f19100037b47ad852b2872d8d075b6a489478c08 SHA-256: 93374a5862bde25e889e21fc0e9a3be1d85d7ab5f931427ab54dd60c08ececea

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded objects and utilizes XFA forms with risky executable scripts, indicated by high-severity heuristics like PDF_XFA_SCRIPT and PDF_UNESCAPE. The ML classifier strongly flags this as malicious. The primary attack vector appears to be the exploitation of PDF vulnerabilities to run embedded JavaScript, which likely downloads and executes a second-stage payload, as suggested by the embedded_file_obj0008.bin artifact.

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` `399f60db8de441c8d00ad08872330f1324d14f71cc02c85786161fd81bd3a6d1`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15034 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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