PDF malware analysis — malicious · 3b256bb999fd2368

MALICIOUS

PDF

105.6 KB

MD5: 6b25caae640c905a49f336a745ececf2 SHA-1: 00311e8d51b1eb8ba18bda0e1c3132a3ce059842 SHA-256: 3b256bb999fd236827f21e15f869bd3570a62f6b5f099f554df35c11b3e835aa

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded content and utilizes XFA forms with risky executable scripts, indicated by multiple high and medium severity heuristic firings. The presence of 'unescape()' calls and 'ASCIIHexDecode' filters suggests obfuscation and potential exploit delivery. The embedded file 'embedded_file_obj0008.bin' is flagged as a suspicious artifact, likely containing a script payload designed to download and execute 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` `b17529bcd550f7fa4c82363d0b6cd56f52937a01ec667b30a543c60c4c4e446a`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15334 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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