PDF malware analysis — malicious · aac02a1eec2b1613

MALICIOUS

PDF

107.4 KB

MD5: 9fe7b650b4aa570b7e2ac4830b8e5499 SHA-1: 0a2d9bddeddebfe18bd5d0960e60bcd767e9d3b7 SHA-256: aac02a1eec2b1613958ce1cfcaa12ec0a2f8c78824fd52641b19d49e7b7cff13

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF exhibits multiple high-severity indicators of maliciousness, including the presence of risky executable scripts within an XFA form and the use of PDF unescape functions. An embedded file was also detected, suggesting a potential multi-stage attack. The ML classifier strongly indicates maliciousness. The exact script functionality is obscured, but the overall pattern points to a downloader or exploit delivery mechanism.

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` `b28087f287be1b6a1ae4334b1d4219dabab184953563b905593058c3fc7857a9`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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