PDF malware analysis — malicious · b2f3a30e37cf2125

MALICIOUS

PDF

105.5 KB

MD5: 192dd501b050d33a1ba93f0f92aa8d87 SHA-1: 759aef0f72f80b89f67d6f20565a8da50f5845eb SHA-256: b2f3a30e37cf212593be15d226d031cd61d77ff6187fd9ef0f66e8b5da0473b3

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains multiple high-severity heuristics indicating malicious activity, including embedded script payloads and XFA forms with executable scripts. The ML classifier strongly flags this as malicious. The presence of an embedded file, 'embedded_file_obj0008.bin', suggests a multi-stage attack where this file is likely the next stage payload. The unescape() call and ASCIIHexDecode filter are common obfuscation techniques used in PDF exploits.

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` `2da1f8ed764ee5c5252b8284cbc24ad287e7b23cec055345b5b773b7f8888633`	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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