PDF malware analysis — malicious · 81c7ea8660247bf1

MALICIOUS

PDF

105.6 KB

MD5: 96cc9afbc39e52eb783809b573206282 SHA-1: 3c7d82fa2fafc4dcea16cac4bfa2eff5d5d208b5 SHA-256: 81c7ea8660247bf115766759229ae72a4fef150d2fcbfbbc7b865abdbf181ecf

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1027 Obfuscated Files or Information T1059.007 JavaScript/VBScript

The PDF contains embedded objects and uses XFA forms with executable scripts, indicating a malicious intent to exploit vulnerabilities. The ML classifier strongly flags this PDF as malicious. The presence of an embedded file, 'embedded_file_obj0008.bin', suggests it's a dropper for a secondary payload.

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` `248ee03eef939ca9643af361a2d6ab8828c476b8d18ef7466e397aa392f3611d`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15334 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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