PDF malware analysis — malicious · b98f0929d44b4d51

MALICIOUS

PDF

105.6 KB

MD5: 485f1c31d1021be6a78e732cf561076d SHA-1: 135c962d2a15c835848eeef1894c52ef903ec0b8 SHA-256: b98f0929d44b4d51299409f6d966dd3e660d3b8580190e4b09ef19c44248b504

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains multiple indicators of malicious activity, including embedded files and XFA forms with executable scripts. The presence of `unescape()` calls and ASCIIHexDecode filters suggests an attempt to obfuscate malicious content. The primary attack vector appears to be the exploitation of a PDF vulnerability to deliver an embedded script payload, likely for further execution.

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` `0361a58b1b506d7302d5e7b5453de4858e68fa701d04f135ee1c8a5a70ca8de1`	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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