PDF malware analysis — malicious · c52ac30181443c42

MALICIOUS

PDF

106.4 KB

MD5: b6e44216f01592ebaf18538aed26f99c SHA-1: db2c976948fd3ab5d5a76e839c1c25818973be87 SHA-256: c52ac30181443c428524c8676e6ba4ded519ca1d919b4fa6e6a9edeb0533e3f4

228 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded content and utilizes XFA forms with executable scripts, indicating a malicious intent to exploit vulnerabilities. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely a dropper for further malware. The presence of an embedded file, 'embedded_file_obj0008.bin', is a key indicator of the payload delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
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` `1e98d17a0e6c2a83e10fe57fa1beb81de8926d6667d4e082f069d43b9a14495d`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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