PDF malware analysis — malicious · ecfb08b38bafedfe

MALICIOUS

PDF

19.8 KB

MD5: 7dc172e9c20833689d9cb306dc044f86 SHA-1: 6c7dbc5ac49a2e77376506c54f4dc4ac6514a002 SHA-256: ecfb08b38bafedfebe2ed9175d10b0490a4afdf62597a628e0f083e406e58a2a

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA (XML Forms Architecture) elements, which are known to be a vector for exploits. Specifically, the PDF_XFA_HEAP_SPRAY heuristic indicates the presence of exploit code designed to spray the heap. This is further supported by the PDF_EMBEDDED_SCRIPT_PAYLOAD firing, suggesting that JavaScript is embedded within the PDF. The ClamAV detection of 'Pdf.Dropper.Agent-6290780-0' confirms the malicious nature of the file, likely acting as a dropper for further malicious activity.

Heuristics 6

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: Pdf.Dropper.Agent-6290780-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6290780-0
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_off00000047.js` `74aa444ea9522b499a63f1a16e6c6ddb5165ad7d975c61416262a5ff9e6a1c7e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x47	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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