PDF malware analysis — malicious · 3a9608395334082f

MALICIOUS

PDF

103.4 KB

MD5: b2a602dca13afd39135e403f6be570de SHA-1: 722930842e489f7c6c10cda57b3e4752b481e3b1 SHA-256: 3a9608395334082f725a823c1f036c9f411805c8905fb909e25f1b9499887c53

168 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample was flagged as malicious by an ML classifier with high confidence. Static analysis revealed several indicators of malicious activity, including the use of unescape() calls and ASCIIHexDecode filters, common in PDF exploits. The presence of an embedded script payload and an embedded file suggests the document is intended to download and execute a second-stage payload. The ML classifier's output strongly supports a malicious intent.

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` `ab2a78bc30b29e4de43979f83c5d95b781f8a7c31483cdb7e700531607421758`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15022 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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