Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd88a45921d0bba2…

MALICIOUS

PDF

8.0 KB First seen: 2026-05-10
MD5: 212809506689ac46eba11914cb2e05d2 SHA-1: d3a2a4944cbac4cabb0387d52749b6b9a352f103 SHA-256: fd88a45921d0bba22974242249fbb7d42112fdcc3d374c1c479535d28031dcdf
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated, as suggested by the EXTRACTED_FILE_STATIC_TRIAGE heuristic. The String.fromCharCode heuristic further points to code manipulation. While no specific malicious URLs or scripts were directly extracted and readable, the presence of obfuscated JavaScript strongly suggests an attempt to download and execute a secondary payload or perform other malicious actions. The benign URLs present do not detract from this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9224

Heuristics 5

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    isgngva="0T1+1Z1f2Z1d3K1b3]1`2h1^3b1[2V2g1H1S1V2d1T3Z3_1O1P272f1M3^1K3S1I3f3h1F2]1D3L1B3d1:1=1>2Y2e1;2T2W1215163/33133+3-1.1/3G3T1,3=3E0^0i3`0g3M0c0d242R0a3a0_2L2U0Y0Z2[2_0W3P0U3N3Y0:0K0P2O0N2^0L3V3X0I2J0G2b0A0D2S0B3I3Q0=0>3W3c0;2X3R06072`3O042a2c";erfqcm="FNeLCFj9=LehXLcPW9,05.Kh>a^b,g>@?:hIO_a_W9,05.UeECfVQI_I?0RI`7VhZY//O??1K-/L?5ceMZKL[2T>@?;I454Rg2BV<RG;c:[BOI/N85.[LeHf@J9TPaHMcR`ZT>@?:aN_0QRg2BV<4O/KI45,LZRVTOZKTY7Y5R:ZZM`-TQ_HRj:ZZM]ac?454SF2DO4RG:AR4+:4+;>RVTOZKT.gg7:eJY@J**+>RVTOZKT3,9= …
  • 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. (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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000328.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 2942 bytes
SHA-256: 1f0ce08c9bbfadd996fb7d463f087f77c4895e5b94cc2a02824dbf91faec83eb
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes
SHA-256: c5f8beff41199686134b9e36c552a51e51e4578713bdc537d83aafa2b58149fe

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