PDF malware analysis — malicious · 48a538445ef09f71

MALICIOUS

PDF

105.5 KB

MD5: ee4585aaa89b338237acf6e171a6c455 SHA-1: dcf5f2b36ca0f1b704525da6065ba2fcee6f6153 SHA-256: 48a538445ef09f71b3e6a16dd2f202c642f0a911ecc5074a84ff09025bc70956

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF exhibits multiple high-severity heuristic firings indicating malicious intent, including embedded script payloads and XFA forms with risky executable scripts. The ML classifier strongly flags this PDF as malicious. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting a multi-stage attack. The presence of PDF_UNESCAPE and PDF_FILTER_HEX rules points towards obfuscation techniques used to hide malicious content.

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` `34f0f42ea803399ecb98e40f94c329912ef0ab79589b723460d66cddba59b435`	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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