PDF malware analysis — malicious · 7c2e6355245014f0

MALICIOUS

PDF

33.6 KB

MD5: f79993e9e66811c122e3b274c5e9d518 SHA-1: 1dfe7b6fddfd8e681021ef0031b87c262b86ee71 SHA-256: 7c2e6355245014f0a3a66544cd727efc3e69ac6608a6d36b461ea04041b09e6d

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF file contains XFA JavaScript that triggers a heap spray exploit, as indicated by the PDF_XFA_HEAP_SPRAY heuristic. This exploit is designed to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature. No specific family could be identified, but the attack pattern is consistent with PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

Heuristics 7

XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. 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_000_off00000053.js` `f88fadc9f4acc60734f46a7486feef2f79977b9a3ff3820f000bbfb89fd6f3f6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53	84636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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