PDF malware analysis — malicious · bde079e5f59ee7a3

MALICIOUS

PDF

19.9 KB

MD5: 4c57457694bf1c20bcaa006e0cb310f9 SHA-1: 29f2f0f2cebb6a0c334b07bfafd9d442cee8c3aa SHA-256: bde079e5f59ee7a3ba953947a8bc752bf5f519434205223b34447ab48f946b36

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains critical heuristic firings for XFA heap spray and embedded script payloads. The embedded JavaScript, identified as 'stream_000_off00000043.js', is highly suspicious and likely responsible for executing a second-stage payload. The presence of XFA and heap spray techniques indicates an attempt to exploit a browser or PDF reader vulnerability.

Heuristics 5

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.
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)
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_off00000043.js` `12fb2b463d3a41a6fb4e8cfebbbfba95bba20bed20e333201742145c98f05553`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 24 long base64-like blob(s).

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