PDF malware analysis — malicious · a8d1212b3087e75a

MALICIOUS

PDF

103.5 KB

MD5: d528a160dedc769e57ec7328716656ba SHA-1: 99fa08ce5a3444be6c74c5d810ff944572d7bd63 SHA-256: a8d1212b3087e75a5f3823808f849bb5af2d2f9ef943eca7c76b00b780322400

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1027 Obfuscated Files or Information T1059.001 PowerShell

The PDF exhibits multiple high-severity heuristic firings, including embedded scripts and the use of unescape functions, strongly indicating malicious intent. The ML classifier also flagged it with high confidence. An embedded file artifact was extracted, suggesting a downloader or dropper functionality. The presence of XFA forms with executable scripts points towards exploitation of PDF reader vulnerabilities.

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` `802b72ac314a4c5b444baf48dbb402277aaba71692d652b447d798f30d3e6d7f`	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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