PDF malware analysis — malicious · 8db5374fc9850422

MALICIOUS

PDF

103.3 KB

MD5: b15245692e3945d4243439ba8ca12f5c SHA-1: 6241f6739c71b5d129498caa31b3af4099359007 SHA-256: 8db5374fc9850422a202981ff78b6d435b89039e664c359474c3063c437a07d9

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple high-severity heuristics indicating malicious intent, including embedded script payloads and XFA form exploitation. 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 stage. The unescape() call and ASCIIHexDecode filter are common techniques for obfuscating malicious JavaScript within PDFs.

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` `4948c7ed9a7baf18dd935e0802ab8b732585847145f561b67b6cdcc041c7ba41`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	14998 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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