PDF malware analysis — malicious · 844a48a17beac8bf

MALICIOUS

PDF

103.1 KB

MD5: c7664227f3a2b4689580531089f4a21e SHA-1: f06ee57e245b46bc8c5b1022ad227e46dbabc7ea SHA-256: 844a48a17beac8bfe493c53215c0784de740d56e5eec19f54b5bb433ce180efd

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains multiple high-severity heuristic firings indicating embedded content and risky executable scripts within an XFA form. The ML classifier strongly flags this PDF as malicious. An embedded file named 'embedded_file_obj0008.bin' was extracted, suggesting it's a downloader or part of a multi-stage attack. The PDF uses obfuscation techniques like ASCIIHexDecode and unescape() calls.

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` `2fc10742faba45081d5a9b5152a075d1ff7f91d0f73573e9b5a6d5c9fe3a9fe2`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	14974 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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