PDF malware analysis — malicious · f6678ff1c2055f7c

MALICIOUS

PDF

193.2 KB Created: 2011-07-12 10:25:36 +08:00 Authoring application: SmartPrinter V4.0

MD5: b61e559519f36ae5b8c6070b93c05a3c SHA-1: c4cce37b120b5e15c3e558c82125fc6135dc21a4 SHA-256: f6678ff1c2055f7c19bedfdadbc7e7a275bff9ff81828487e38c3638d01ce4fc

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and a secondary embedded PDF, both flagged as suspicious. The ML classifier strongly indicates maliciousness. The presence of JavaScript actions and streams, along with the 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristic, suggests the PDF is designed to exploit vulnerabilities and likely download and execute additional malicious content. The extracted artifacts 'javascript_obj0006_000.js' and 'polyglot_child_pdf_off00017618.pdf' are key indicators of this multi-stage attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 5

Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `ff856f272a52c1480d3305f6c82c53e85b0ddf5718abd4f3314f3a3726757db2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x12D	15946 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`font_00_sfnt_off0001bed0.bin` `0bf1c57046cb4e268e2c15454a1be3e6bd70aec440451648e7ffae6d1706f56c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BED0	21284 bytes
`font_01_sfnt_off0001e906.bin` `3f7fb02b5829df5e27a79fe9d7b6232716a28325c5ef1a4743ce1a884a0168a3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E906	268600 bytes
`polyglot_child_pdf_off00017618.pdf` `370f8d03ae65a7905adbc2ae68fd0c042a3d0901b0f65ab29fe4997cbbad00f2`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x17618	102027 bytes

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