PDF malware analysis — malicious · b4bc51b44936e693

MALICIOUS

PDF

7.2 KB Created: 2012-05-24 13:41:19

MD5: 2cdb3afb6237ce07ed5371d3c2ab38ef SHA-1: 2b7dbbd25db34850abb03419c90bb80d616549eb SHA-256: b4bc51b44936e693928cca6e2a90afa8fed89f84b36b27717d47fe708602bd08

68 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file flagged by multiple heuristics as malicious, including an ML classifier with a high confidence score. It contains an embedded script payload and an embedded file, indicating it's designed to deliver a secondary malicious artifact. The document body text appears to be obfuscated or corrupted, providing no clear lure.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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` `54053008032d6120b11973a55d325cbfec7dd49e8d222f7e5719e53a48774e6c`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xBFE	6989 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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