PDF malware analysis — malicious · 767922c4008f00a8

MALICIOUS

PDF

105.5 KB

MD5: 4b935ed32af45ecebd4f83add1797061 SHA-1: 3452cd46056ad6fd9a24da2e1f7ef068a98ce4bd SHA-256: 767922c4008f00a81cc145f11ac88bf3a10605452fb1d1f89be892837bc06beb

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1027 Obfuscated Files or Information T1566.002 Phishing: Spearphishing Attachment

The PDF file exhibits multiple high and medium severity heuristic firings related to embedded scripts, XFA forms, and potential exploit indicators. Specifically, the presence of 'unescape()' calls and 'ASCIIHexDecode' filters suggests an attempt to obfuscate and deliver malicious content. The heuristic 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' indicate that risky executable scripts are present within the PDF structure, likely intended to download and execute a second-stage payload or exploit a vulnerability. An embedded file, 'embedded_file_obj0008.bin', was also extracted, which could contain further malicious content.

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` `b4a91e55c40c09bffb721ce7b16c535c55561dea85183700735f6e43577a3461`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15322 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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