PDF malware analysis — malicious · 20b835153625a7b7

MALICIOUS

PDF

5.2 KB Created: 2012-06-11 17:19:01 Authoring application: a5sk

MD5: b098817385486417e367cce9af0a8c54 SHA-1: 4970cbd4094456c56265f429b2d6fdbc1a64f940 SHA-256: 20b835153625a7b7cc0d56a6041bbc86b723e7ff0d8e927e6feba381aa659daa

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a high-severity XFA form with executable script, indicated by multiple heuristic firings including PDF_XFA_SCRIPT and PDF_UNESCAPE. The ML classifier also flagged this PDF as malicious with high confidence. The decompressed JavaScript payload, stream_002_off0000031a.js, is the primary indicator of malicious activity, likely serving as a downloader or initial execution vector for a second-stage payload.

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.
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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_002_off0000031a.js` `5eb01515b67213a66c4d83c2fa52ea22e8a60e655be137a412f6cdbf350d95b7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31A	60857 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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