PDF malware analysis — malicious · c1e5ec4372c8ae35

MALICIOUS

PDF

105.8 KB

MD5: 75c7af32783933e9b8fe8cc2bd3cc4f7 SHA-1: 494c7c322d5444aa8fad85c3cb0d542974feb8bb SHA-256: c1e5ec4372c8ae359a58166e168b87f21d880480b4bebe8cdba56326903c8ee5

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript T1566.002 Spearphishing Attachment

The PDF file contains XFA forms and embedded scripts, indicated by multiple high and medium severity heuristic firings. The 'PDF_UNESCAPE' and 'PDF_FILTER_HEX' rules suggest obfuscation techniques commonly used to hide malicious content. An embedded file, 'embedded_file_obj0008.bin', was also extracted, likely containing the secondary payload. The combination of these factors points to a malicious PDF designed to execute embedded scripts and deliver further malware.

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` `cc7b42628494ae05443545977993d15b508a0accc9e71db85104fe5a0add70f4`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15370 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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