PDF malware analysis — malicious · c4318c42ee62f56e

MALICIOUS

PDF

104.7 KB

MD5: b0cd6d9efa395d342b9d29337065382b SHA-1: b3c9c9b8d7bc713d59ae675c75d17a8c4c25be45 SHA-256: c4318c42ee62f56e07dae0587d54f9d5f4d7bb699f0e3fbda5f44371f3c5c8cc

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF exhibits multiple high-severity heuristic firings related to embedded scripts and exploit indicators, including PDF_UNESCAPE and PDF_XFA_SCRIPT. The ML classifier strongly flags this PDF as malicious. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting a potential secondary payload delivery mechanism. The presence of XFA forms and unescape calls points towards an attempt to execute malicious code within the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `909f10f245775120ac8607b82453de03c1867bc58f9fade4df8c416ebabe0569`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15202 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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