PDF malware analysis — malicious · 53b879ac57f8c7b6

MALICIOUS

PDF

104.7 KB

MD5: 4c7cd84dc4ff35f4890069d918d47e13 SHA-1: 43fd7ec6a4e551390bda9f7ec5aaddef3258a956 SHA-256: 53b879ac57f8c7b65d358d617d31b4c3d4d181f5695fb3ff64fa1794f303908e

198 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded scripts and uses obfuscation techniques, including ASCIIHexDecode and unescape calls, indicating a malicious intent to exploit vulnerabilities. The ClamAV detection 'Pdf.Exploit.Dropped-78' strongly suggests it's a known exploit dropper. The embedded file artifact further supports the payload delivery mechanism.

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` `51fbc94ae936330bcc7c92b2a5bd759c9c0b000ded960f0a0757749946a09025`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15203 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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