PDF malware analysis — malicious · a5b422121e105502

MALICIOUS

PDF

5.3 KB Created: 2011-04-05 23:46:28 Authoring application: bfub loab

MD5: 03ffc568802ebdb9a0a9df232264a956 SHA-1: a441f198b13a74dd79ea266f47be0ce004c036c9 SHA-256: a5b422121e105502f7d5842d48ebf5da7d671f61aa60ca56f23b68f8b4bf8cec

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a high-confidence ML classifier flag for maliciousness and exhibits several high-severity heuristic firings related to XFA forms and embedded scripts. The presence of an embedded JavaScript file, stream_001_off00000334.js, strongly suggests that the PDF is designed to execute malicious code. The script likely downloads and executes a second-stage payload, contributing to the overall malicious intent of the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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
`stream_001_off00000334.js` `a93d53c7c7db83b23b902eafe09aa68e28633d3ef4fc3737a313c0303cf5b1b4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x334	56130 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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